fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <[email protected]>
  10  *  Andy Adamson   <[email protected]>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57 #include <linux/iversion.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4idmap.h"
  67 #include "nfs4session.h"
  68 #include "fscache.h"
  69
  70 #include "nfs4trace.h"
  71
  72 #define NFSDBG_FACILITY         NFSDBG_PROC
  73
  74 #define NFS4_BITMASK_SZ         3
  75
  76 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  77 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  78
  79 /* file attributes which can be mapped to nfs attributes */
  80 #define NFS4_VALID_ATTRS (ATTR_MODE \
  81         | ATTR_UID \
  82         | ATTR_GID \
  83         | ATTR_SIZE \
  84         | ATTR_ATIME \
  85         | ATTR_MTIME \
  86         | ATTR_CTIME \
  87         | ATTR_ATIME_SET \
  88         | ATTR_MTIME_SET)
  89
  90 struct nfs4_opendata;
  91 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  92 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  93 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  94 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label, struct inode *inode);
  95 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);
  96 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
  97                             struct nfs_fattr *fattr, struct iattr *sattr,
  98                             struct nfs_open_context *ctx, struct nfs4_label *ilabel,
  99                             struct nfs4_label *olabel);
 100 #ifdef CONFIG_NFS_V4_1
 101 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
 102                 const struct cred *cred,
 103                 struct nfs4_slot *slot,
 104                 bool is_privileged);
 105 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 106                 const struct cred *);
 107 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 108                 const struct cred *, bool);
 109 #endif
 110
 111 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 112 static inline struct nfs4_label *
 113 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 114         struct iattr *sattr, struct nfs4_label *label)
 115 {
 116         int err;
 117
 118         if (label == NULL)
 119                 return NULL;
 120
 121         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 122                 return NULL;
 123
 124         err = security_dentry_init_security(dentry, sattr->ia_mode,
 125                                 &dentry->d_name, (void **)&label->label, &label->len);
 126         if (err == 0)
 127                 return label;
 128
 129         return NULL;
 130 }
 131 static inline void
 132 nfs4_label_release_security(struct nfs4_label *label)
 133 {
 134         if (label)
 135                 security_release_secctx(label->label, label->len);
 136 }
 137 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 {
 139         if (label)
 140                 return server->attr_bitmask;
 141
 142         return server->attr_bitmask_nl;
 143 }
 144 #else
 145 static inline struct nfs4_label *
 146 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 147         struct iattr *sattr, struct nfs4_label *l)
 148 { return NULL; }
 149 static inline void
 150 nfs4_label_release_security(struct nfs4_label *label)
 151 { return; }
 152 static inline u32 *
 153 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 154 { return server->attr_bitmask; }
 155 #endif
 156
 157 /* Prevent leaks of NFSv4 errors into userland */
 158 static int nfs4_map_errors(int err)
 159 {
 160         if (err >= -1000)
 161                 return err;
 162         switch (err) {
 163         case -NFS4ERR_RESOURCE:
 164         case -NFS4ERR_LAYOUTTRYLATER:
 165         case -NFS4ERR_RECALLCONFLICT:
 166                 return -EREMOTEIO;
 167         case -NFS4ERR_WRONGSEC:
 168         case -NFS4ERR_WRONG_CRED:
 169                 return -EPERM;
 170         case -NFS4ERR_BADOWNER:
 171         case -NFS4ERR_BADNAME:
 172                 return -EINVAL;
 173         case -NFS4ERR_SHARE_DENIED:
 174                 return -EACCES;
 175         case -NFS4ERR_MINOR_VERS_MISMATCH:
 176                 return -EPROTONOSUPPORT;
 177         case -NFS4ERR_FILE_OPEN:
 178                 return -EBUSY;
 179         default:
 180                 dprintk("%s could not handle NFSv4 error %d\n",
 181                                 __func__, -err);
 182                 break;
 183         }
 184         return -EIO;
 185 }
 186
 187 /*
 188  * This is our standard bitmap for GETATTR requests.
 189  */
 190 const u32 nfs4_fattr_bitmap[3] = {
 191         FATTR4_WORD0_TYPE
 192         | FATTR4_WORD0_CHANGE
 193         | FATTR4_WORD0_SIZE
 194         | FATTR4_WORD0_FSID
 195         | FATTR4_WORD0_FILEID,
 196         FATTR4_WORD1_MODE
 197         | FATTR4_WORD1_NUMLINKS
 198         | FATTR4_WORD1_OWNER
 199         | FATTR4_WORD1_OWNER_GROUP
 200         | FATTR4_WORD1_RAWDEV
 201         | FATTR4_WORD1_SPACE_USED
 202         | FATTR4_WORD1_TIME_ACCESS
 203         | FATTR4_WORD1_TIME_METADATA
 204         | FATTR4_WORD1_TIME_MODIFY
 205         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 206 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 207         FATTR4_WORD2_SECURITY_LABEL
 208 #endif
 209 };
 210
 211 static const u32 nfs4_pnfs_open_bitmap[3] = {
 212         FATTR4_WORD0_TYPE
 213         | FATTR4_WORD0_CHANGE
 214         | FATTR4_WORD0_SIZE
 215         | FATTR4_WORD0_FSID
 216         | FATTR4_WORD0_FILEID,
 217         FATTR4_WORD1_MODE
 218         | FATTR4_WORD1_NUMLINKS
 219         | FATTR4_WORD1_OWNER
 220         | FATTR4_WORD1_OWNER_GROUP
 221         | FATTR4_WORD1_RAWDEV
 222         | FATTR4_WORD1_SPACE_USED
 223         | FATTR4_WORD1_TIME_ACCESS
 224         | FATTR4_WORD1_TIME_METADATA
 225         | FATTR4_WORD1_TIME_MODIFY,
 226         FATTR4_WORD2_MDSTHRESHOLD
 227 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 228         | FATTR4_WORD2_SECURITY_LABEL
 229 #endif
 230 };
 231
 232 static const u32 nfs4_open_noattr_bitmap[3] = {
 233         FATTR4_WORD0_TYPE
 234         | FATTR4_WORD0_FILEID,
 235 };
 236
 237 const u32 nfs4_statfs_bitmap[3] = {
 238         FATTR4_WORD0_FILES_AVAIL
 239         | FATTR4_WORD0_FILES_FREE
 240         | FATTR4_WORD0_FILES_TOTAL,
 241         FATTR4_WORD1_SPACE_AVAIL
 242         | FATTR4_WORD1_SPACE_FREE
 243         | FATTR4_WORD1_SPACE_TOTAL
 244 };
 245
 246 const u32 nfs4_pathconf_bitmap[3] = {
 247         FATTR4_WORD0_MAXLINK
 248         | FATTR4_WORD0_MAXNAME,
 249         0
 250 };
 251
 252 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 253                         | FATTR4_WORD0_MAXREAD
 254                         | FATTR4_WORD0_MAXWRITE
 255                         | FATTR4_WORD0_LEASE_TIME,
 256                         FATTR4_WORD1_TIME_DELTA
 257                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 258                         FATTR4_WORD2_LAYOUT_BLKSIZE
 259                         | FATTR4_WORD2_CLONE_BLKSIZE
 260 };
 261
 262 const u32 nfs4_fs_locations_bitmap[3] = {
 263         FATTR4_WORD0_CHANGE
 264         | FATTR4_WORD0_SIZE
 265         | FATTR4_WORD0_FSID
 266         | FATTR4_WORD0_FILEID
 267         | FATTR4_WORD0_FS_LOCATIONS,
 268         FATTR4_WORD1_OWNER
 269         | FATTR4_WORD1_OWNER_GROUP
 270         | FATTR4_WORD1_RAWDEV
 271         | FATTR4_WORD1_SPACE_USED
 272         | FATTR4_WORD1_TIME_ACCESS
 273         | FATTR4_WORD1_TIME_METADATA
 274         | FATTR4_WORD1_TIME_MODIFY
 275         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 276 };
 277
 278 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 279                 struct inode *inode)
 280 {
 281         unsigned long cache_validity;
 282
 283         memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
 284         if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
 285                 return;
 286
 287         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 288         if (!(cache_validity & NFS_INO_REVAL_FORCED))
 289                 cache_validity &= ~(NFS_INO_INVALID_CHANGE
 290                                 | NFS_INO_INVALID_SIZE);
 291
 292         if (!(cache_validity & NFS_INO_INVALID_SIZE))
 293                 dst[0] &= ~FATTR4_WORD0_SIZE;
 294
 295         if (!(cache_validity & NFS_INO_INVALID_CHANGE))
 296                 dst[0] &= ~FATTR4_WORD0_CHANGE;
 297 }
 298
 299 static void nfs4_bitmap_copy_adjust_setattr(__u32 *dst,
 300                 const __u32 *src, struct inode *inode)
 301 {
 302         nfs4_bitmap_copy_adjust(dst, src, inode);
 303 }
 304
 305 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 306                 struct nfs4_readdir_arg *readdir)
 307 {
 308         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 309         __be32 *start, *p;
 310
 311         if (cookie > 2) {
 312                 readdir->cookie = cookie;
 313                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 314                 return;
 315         }
 316
 317         readdir->cookie = 0;
 318         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 319         if (cookie == 2)
 320                 return;
 321
 322         /*
 323          * NFSv4 servers do not return entries for '.' and '..'
 324          * Therefore, we fake these entries here.  We let '.'
 325          * have cookie 0 and '..' have cookie 1.  Note that
 326          * when talking to the server, we always send cookie 0
 327          * instead of 1 or 2.
 328          */
 329         start = p = kmap_atomic(*readdir->pages);
 330
 331         if (cookie == 0) {
 332                 *p++ = xdr_one;                                  /* next */
 333                 *p++ = xdr_zero;                   /* cookie, first word */
 334                 *p++ = xdr_one;                   /* cookie, second word */
 335                 *p++ = xdr_one;                             /* entry len */
 336                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 337                 p++;
 338                 *p++ = xdr_one;                         /* bitmap length */
 339                 *p++ = htonl(attrs);                           /* bitmap */
 340                 *p++ = htonl(12);             /* attribute buffer length */
 341                 *p++ = htonl(NF4DIR);
 342                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 343         }
 344
 345         *p++ = xdr_one;                                  /* next */
 346         *p++ = xdr_zero;                   /* cookie, first word */
 347         *p++ = xdr_two;                   /* cookie, second word */
 348         *p++ = xdr_two;                             /* entry len */
 349         memcpy(p, "..\0\0", 4);                         /* entry */
 350         p++;
 351         *p++ = xdr_one;                         /* bitmap length */
 352         *p++ = htonl(attrs);                           /* bitmap */
 353         *p++ = htonl(12);             /* attribute buffer length */
 354         *p++ = htonl(NF4DIR);
 355         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 356
 357         readdir->pgbase = (char *)p - (char *)start;
 358         readdir->count -= readdir->pgbase;
 359         kunmap_atomic(start);
 360 }
 361
 362 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 363                 nfs4_stateid *stateid,
 364                 const struct cred *cred)
 365 {
 366         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 367
 368         ops->test_and_free_expired(server, stateid, cred);
 369 }
 370
 371 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 372                 nfs4_stateid *stateid,
 373                 const struct cred *cred)
 374 {
 375         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 376         nfs4_test_and_free_stateid(server, stateid, cred);
 377 }
 378
 379 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 380                 const nfs4_stateid *stateid,
 381                 const struct cred *cred)
 382 {
 383         nfs4_stateid tmp;
 384
 385         nfs4_stateid_copy(&tmp, stateid);
 386         __nfs4_free_revoked_stateid(server, &tmp, cred);
 387 }
 388
 389 static long nfs4_update_delay(long *timeout)
 390 {
 391         long ret;
 392         if (!timeout)
 393                 return NFS4_POLL_RETRY_MAX;
 394         if (*timeout <= 0)
 395                 *timeout = NFS4_POLL_RETRY_MIN;
 396         if (*timeout > NFS4_POLL_RETRY_MAX)
 397                 *timeout = NFS4_POLL_RETRY_MAX;
 398         ret = *timeout;
 399         *timeout <<= 1;
 400         return ret;
 401 }
 402
 403 static int nfs4_delay_killable(long *timeout)
 404 {
 405         might_sleep();
 406
 407         freezable_schedule_timeout_killable_unsafe(
 408                 nfs4_update_delay(timeout));
 409         if (!__fatal_signal_pending(current))
 410                 return 0;
 411         return -EINTR;
 412 }
 413
 414 static int nfs4_delay_interruptible(long *timeout)
 415 {
 416         might_sleep();
 417
 418         freezable_schedule_timeout_interruptible(nfs4_update_delay(timeout));
 419         if (!signal_pending(current))
 420                 return 0;
 421         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 422 }
 423
 424 static int nfs4_delay(long *timeout, bool interruptible)
 425 {
 426         if (interruptible)
 427                 return nfs4_delay_interruptible(timeout);
 428         return nfs4_delay_killable(timeout);
 429 }
 430
 431 static const nfs4_stateid *
 432 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 433 {
 434         if (!stateid)
 435                 return NULL;
 436         switch (stateid->type) {
 437         case NFS4_OPEN_STATEID_TYPE:
 438         case NFS4_LOCK_STATEID_TYPE:
 439         case NFS4_DELEGATION_STATEID_TYPE:
 440                 return stateid;
 441         default:
 442                 break;
 443         }
 444         return NULL;
 445 }
 446
 447 /* This is the error handling routine for processes that are allowed
 448  * to sleep.
 449  */
 450 static int nfs4_do_handle_exception(struct nfs_server *server,
 451                 int errorcode, struct nfs4_exception *exception)
 452 {
 453         struct nfs_client *clp = server->nfs_client;
 454         struct nfs4_state *state = exception->state;
 455         const nfs4_stateid *stateid;
 456         struct inode *inode = exception->inode;
 457         int ret = errorcode;
 458
 459         exception->delay = 0;
 460         exception->recovering = 0;
 461         exception->retry = 0;
 462
 463         stateid = nfs4_recoverable_stateid(exception->stateid);
 464         if (stateid == NULL && state != NULL)
 465                 stateid = nfs4_recoverable_stateid(&state->stateid);
 466
 467         switch(errorcode) {
 468                 case 0:
 469                         return 0;
 470                 case -NFS4ERR_BADHANDLE:
 471                 case -ESTALE:
 472                         if (inode != NULL && S_ISREG(inode->i_mode))
 473                                 pnfs_destroy_layout(NFS_I(inode));
 474                         break;
 475                 case -NFS4ERR_DELEG_REVOKED:
 476                 case -NFS4ERR_ADMIN_REVOKED:
 477                 case -NFS4ERR_EXPIRED:
 478                 case -NFS4ERR_BAD_STATEID:
 479                         if (inode != NULL && stateid != NULL) {
 480                                 nfs_inode_find_state_and_recover(inode,
 481                                                 stateid);
 482                                 goto wait_on_recovery;
 483                         }
 484                         /* Fall through */
 485                 case -NFS4ERR_OPENMODE:
 486                         if (inode) {
 487                                 int err;
 488
 489                                 err = nfs_async_inode_return_delegation(inode,
 490                                                 stateid);
 491                                 if (err == 0)
 492                                         goto wait_on_recovery;
 493                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 494                                         exception->retry = 1;
 495                                         break;
 496                                 }
 497                         }
 498                         if (state == NULL)
 499                                 break;
 500                         ret = nfs4_schedule_stateid_recovery(server, state);
 501                         if (ret < 0)
 502                                 break;
 503                         goto wait_on_recovery;
 504                 case -NFS4ERR_STALE_STATEID:
 505                 case -NFS4ERR_STALE_CLIENTID:
 506                         nfs4_schedule_lease_recovery(clp);
 507                         goto wait_on_recovery;
 508                 case -NFS4ERR_MOVED:
 509                         ret = nfs4_schedule_migration_recovery(server);
 510                         if (ret < 0)
 511                                 break;
 512                         goto wait_on_recovery;
 513                 case -NFS4ERR_LEASE_MOVED:
 514                         nfs4_schedule_lease_moved_recovery(clp);
 515                         goto wait_on_recovery;
 516 #if defined(CONFIG_NFS_V4_1)
 517                 case -NFS4ERR_BADSESSION:
 518                 case -NFS4ERR_BADSLOT:
 519                 case -NFS4ERR_BAD_HIGH_SLOT:
 520                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 521                 case -NFS4ERR_DEADSESSION:
 522                 case -NFS4ERR_SEQ_FALSE_RETRY:
 523                 case -NFS4ERR_SEQ_MISORDERED:
 524                         dprintk("%s ERROR: %d Reset session\n", __func__,
 525                                 errorcode);
 526                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 527                         goto wait_on_recovery;
 528 #endif /* defined(CONFIG_NFS_V4_1) */
 529                 case -NFS4ERR_FILE_OPEN:
 530                         if (exception->timeout > HZ) {
 531                                 /* We have retried a decent amount, time to
 532                                  * fail
 533                                  */
 534                                 ret = -EBUSY;
 535                                 break;
 536                         }
 537                         /* Fall through */
 538                 case -NFS4ERR_DELAY:
 539                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 540                         /* Fall through */
 541                 case -NFS4ERR_GRACE:
 542                 case -NFS4ERR_LAYOUTTRYLATER:
 543                 case -NFS4ERR_RECALLCONFLICT:
 544                         exception->delay = 1;
 545                         return 0;
 546
 547                 case -NFS4ERR_RETRY_UNCACHED_REP:
 548                 case -NFS4ERR_OLD_STATEID:
 549                         exception->retry = 1;
 550                         break;
 551                 case -NFS4ERR_BADOWNER:
 552                         /* The following works around a Linux server bug! */
 553                 case -NFS4ERR_BADNAME:
 554                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 555                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 556                                 exception->retry = 1;
 557                                 printk(KERN_WARNING "NFS: v4 server %s "
 558                                                 "does not accept raw "
 559                                                 "uid/gids. "
 560                                                 "Reenabling the idmapper.\n",
 561                                                 server->nfs_client->cl_hostname);
 562                         }
 563         }
 564         /* We failed to handle the error */
 565         return nfs4_map_errors(ret);
 566 wait_on_recovery:
 567         exception->recovering = 1;
 568         return 0;
 569 }
 570
 571 /* This is the error handling routine for processes that are allowed
 572  * to sleep.
 573  */
 574 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 575 {
 576         struct nfs_client *clp = server->nfs_client;
 577         int ret;
 578
 579         ret = nfs4_do_handle_exception(server, errorcode, exception);
 580         if (exception->delay) {
 581                 ret = nfs4_delay(&exception->timeout,
 582                                 exception->interruptible);
 583                 goto out_retry;
 584         }
 585         if (exception->recovering) {
 586                 ret = nfs4_wait_clnt_recover(clp);
 587                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 588                         return -EIO;
 589                 goto out_retry;
 590         }
 591         return ret;
 592 out_retry:
 593         if (ret == 0)
 594                 exception->retry = 1;
 595         return ret;
 596 }
 597
 598 static int
 599 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 600                 int errorcode, struct nfs4_exception *exception)
 601 {
 602         struct nfs_client *clp = server->nfs_client;
 603         int ret;
 604
 605         ret = nfs4_do_handle_exception(server, errorcode, exception);
 606         if (exception->delay) {
 607                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 608                 goto out_retry;
 609         }
 610         if (exception->recovering) {
 611                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 612                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 613                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 614                 goto out_retry;
 615         }
 616         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 617                 ret = -EIO;
 618         return ret;
 619 out_retry:
 620         if (ret == 0) {
 621                 exception->retry = 1;
 622                 /*
 623                  * For NFS4ERR_MOVED, the client transport will need to
 624                  * be recomputed after migration recovery has completed.
 625                  */
 626                 if (errorcode == -NFS4ERR_MOVED)
 627                         rpc_task_release_transport(task);
 628         }
 629         return ret;
 630 }
 631
 632 int
 633 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 634                         struct nfs4_state *state, long *timeout)
 635 {
 636         struct nfs4_exception exception = {
 637                 .state = state,
 638         };
 639
 640         if (task->tk_status >= 0)
 641                 return 0;
 642         if (timeout)
 643                 exception.timeout = *timeout;
 644         task->tk_status = nfs4_async_handle_exception(task, server,
 645                         task->tk_status,
 646                         &exception);
 647         if (exception.delay && timeout)
 648                 *timeout = exception.timeout;
 649         if (exception.retry)
 650                 return -EAGAIN;
 651         return 0;
 652 }
 653
 654 /*
 655  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 656  * or 'false' otherwise.
 657  */
 658 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 659 {
 660         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 661         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 662 }
 663
 664 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 665 {
 666         spin_lock(&clp->cl_lock);
 667         if (time_before(clp->cl_last_renewal,timestamp))
 668                 clp->cl_last_renewal = timestamp;
 669         spin_unlock(&clp->cl_lock);
 670 }
 671
 672 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 673 {
 674         struct nfs_client *clp = server->nfs_client;
 675
 676         if (!nfs4_has_session(clp))
 677                 do_renew_lease(clp, timestamp);
 678 }
 679
 680 struct nfs4_call_sync_data {
 681         const struct nfs_server *seq_server;
 682         struct nfs4_sequence_args *seq_args;
 683         struct nfs4_sequence_res *seq_res;
 684 };
 685
 686 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 687                         struct nfs4_sequence_res *res, int cache_reply,
 688                         int privileged)
 689 {
 690         args->sa_slot = NULL;
 691         args->sa_cache_this = cache_reply;
 692         args->sa_privileged = privileged;
 693
 694         res->sr_slot = NULL;
 695 }
 696
 697 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 698 {
 699         struct nfs4_slot *slot = res->sr_slot;
 700         struct nfs4_slot_table *tbl;
 701
 702         tbl = slot->table;
 703         spin_lock(&tbl->slot_tbl_lock);
 704         if (!nfs41_wake_and_assign_slot(tbl, slot))
 705                 nfs4_free_slot(tbl, slot);
 706         spin_unlock(&tbl->slot_tbl_lock);
 707
 708         res->sr_slot = NULL;
 709 }
 710
 711 static int nfs40_sequence_done(struct rpc_task *task,
 712                                struct nfs4_sequence_res *res)
 713 {
 714         if (res->sr_slot != NULL)
 715                 nfs40_sequence_free_slot(res);
 716         return 1;
 717 }
 718
 719 #if defined(CONFIG_NFS_V4_1)
 720
 721 static void nfs41_release_slot(struct nfs4_slot *slot)
 722 {
 723         struct nfs4_session *session;
 724         struct nfs4_slot_table *tbl;
 725         bool send_new_highest_used_slotid = false;
 726
 727         if (!slot)
 728                 return;
 729         tbl = slot->table;
 730         session = tbl->session;
 731
 732         /* Bump the slot sequence number */
 733         if (slot->seq_done)
 734                 slot->seq_nr++;
 735         slot->seq_done = 0;
 736
 737         spin_lock(&tbl->slot_tbl_lock);
 738         /* Be nice to the server: try to ensure that the last transmitted
 739          * value for highest_user_slotid <= target_highest_slotid
 740          */
 741         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 742                 send_new_highest_used_slotid = true;
 743
 744         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 745                 send_new_highest_used_slotid = false;
 746                 goto out_unlock;
 747         }
 748         nfs4_free_slot(tbl, slot);
 749
 750         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 751                 send_new_highest_used_slotid = false;
 752 out_unlock:
 753         spin_unlock(&tbl->slot_tbl_lock);
 754         if (send_new_highest_used_slotid)
 755                 nfs41_notify_server(session->clp);
 756         if (waitqueue_active(&tbl->slot_waitq))
 757                 wake_up_all(&tbl->slot_waitq);
 758 }
 759
 760 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 761 {
 762         nfs41_release_slot(res->sr_slot);
 763         res->sr_slot = NULL;
 764 }
 765
 766 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 767                 u32 seqnr)
 768 {
 769         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 770                 slot->seq_nr_highest_sent = seqnr;
 771 }
 772 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot,
 773                 u32 seqnr)
 774 {
 775         slot->seq_nr_highest_sent = seqnr;
 776         slot->seq_nr_last_acked = seqnr;
 777 }
 778
 779 static int nfs41_sequence_process(struct rpc_task *task,
 780                 struct nfs4_sequence_res *res)
 781 {
 782         struct nfs4_session *session;
 783         struct nfs4_slot *slot = res->sr_slot;
 784         struct nfs_client *clp;
 785         int ret = 1;
 786
 787         if (slot == NULL)
 788                 goto out_noaction;
 789         /* don't increment the sequence number if the task wasn't sent */
 790         if (!RPC_WAS_SENT(task) || slot->seq_done)
 791                 goto out;
 792
 793         session = slot->table->session;
 794
 795         trace_nfs4_sequence_done(session, res);
 796         /* Check the SEQUENCE operation status */
 797         switch (res->sr_status) {
 798         case 0:
 799                 /* Mark this sequence number as having been acked */
 800                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 801                 /* Update the slot's sequence and clientid lease timer */
 802                 slot->seq_done = 1;
 803                 clp = session->clp;
 804                 do_renew_lease(clp, res->sr_timestamp);
 805                 /* Check sequence flags */
 806                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 807                                 !!slot->privileged);
 808                 nfs41_update_target_slotid(slot->table, slot, res);
 809                 break;
 810         case 1:
 811                 /*
 812                  * sr_status remains 1 if an RPC level error occurred.
 813                  * The server may or may not have processed the sequence
 814                  * operation..
 815                  */
 816                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 817                 slot->seq_done = 1;
 818                 goto out;
 819         case -NFS4ERR_DELAY:
 820                 /* The server detected a resend of the RPC call and
 821                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 822                  * of RFC5661.
 823                  */
 824                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 825                         __func__,
 826                         slot->slot_nr,
 827                         slot->seq_nr);
 828                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 829                 goto out_retry;
 830         case -NFS4ERR_RETRY_UNCACHED_REP:
 831         case -NFS4ERR_SEQ_FALSE_RETRY:
 832                 /*
 833                  * The server thinks we tried to replay a request.
 834                  * Retry the call after bumping the sequence ID.
 835                  */
 836                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 837                 goto retry_new_seq;
 838         case -NFS4ERR_BADSLOT:
 839                 /*
 840                  * The slot id we used was probably retired. Try again
 841                  * using a different slot id.
 842                  */
 843                 if (slot->slot_nr < slot->table->target_highest_slotid)
 844                         goto session_recover;
 845                 goto retry_nowait;
 846         case -NFS4ERR_SEQ_MISORDERED:
 847                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 848                 /*
 849                  * Were one or more calls using this slot interrupted?
 850                  * If the server never received the request, then our
 851                  * transmitted slot sequence number may be too high.
 852                  */
 853                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 854                         slot->seq_nr--;
 855                         goto retry_nowait;
 856                 }
 857                 /*
 858                  * RFC5661:
 859                  * A retry might be sent while the original request is
 860                  * still in progress on the replier. The replier SHOULD
 861                  * deal with the issue by returning NFS4ERR_DELAY as the
 862                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 863                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 864                  *
 865                  * Restart the search after a delay.
 866                  */
 867                 slot->seq_nr = slot->seq_nr_highest_sent;
 868                 goto out_retry;
 869         default:
 870                 /* Just update the slot sequence no. */
 871                 slot->seq_done = 1;
 872         }
 873 out:
 874         /* The session may be reset by one of the error handlers. */
 875         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 876 out_noaction:
 877         return ret;
 878 session_recover:
 879         nfs4_schedule_session_recovery(session, res->sr_status);
 880         goto retry_nowait;
 881 retry_new_seq:
 882         ++slot->seq_nr;
 883 retry_nowait:
 884         if (rpc_restart_call_prepare(task)) {
 885                 nfs41_sequence_free_slot(res);
 886                 task->tk_status = 0;
 887                 ret = 0;
 888         }
 889         goto out;
 890 out_retry:
 891         if (!rpc_restart_call(task))
 892                 goto out;
 893         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 894         return 0;
 895 }
 896
 897 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 898 {
 899         if (!nfs41_sequence_process(task, res))
 900                 return 0;
 901         if (res->sr_slot != NULL)
 902                 nfs41_sequence_free_slot(res);
 903         return 1;
 904
 905 }
 906 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 907
 908 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 909 {
 910         if (res->sr_slot == NULL)
 911                 return 1;
 912         if (res->sr_slot->table->session != NULL)
 913                 return nfs41_sequence_process(task, res);
 914         return nfs40_sequence_done(task, res);
 915 }
 916
 917 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 918 {
 919         if (res->sr_slot != NULL) {
 920                 if (res->sr_slot->table->session != NULL)
 921                         nfs41_sequence_free_slot(res);
 922                 else
 923                         nfs40_sequence_free_slot(res);
 924         }
 925 }
 926
 927 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 928 {
 929         if (res->sr_slot == NULL)
 930                 return 1;
 931         if (!res->sr_slot->table->session)
 932                 return nfs40_sequence_done(task, res);
 933         return nfs41_sequence_done(task, res);
 934 }
 935 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 936
 937 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 938 {
 939         struct nfs4_call_sync_data *data = calldata;
 940
 941         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 942
 943         nfs4_setup_sequence(data->seq_server->nfs_client,
 944                             data->seq_args, data->seq_res, task);
 945 }
 946
 947 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 948 {
 949         struct nfs4_call_sync_data *data = calldata;
 950
 951         nfs41_sequence_done(task, data->seq_res);
 952 }
 953
 954 static const struct rpc_call_ops nfs41_call_sync_ops = {
 955         .rpc_call_prepare = nfs41_call_sync_prepare,
 956         .rpc_call_done = nfs41_call_sync_done,
 957 };
 958
 959 #else   /* !CONFIG_NFS_V4_1 */
 960
 961 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 962 {
 963         return nfs40_sequence_done(task, res);
 964 }
 965
 966 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 967 {
 968         if (res->sr_slot != NULL)
 969                 nfs40_sequence_free_slot(res);
 970 }
 971
 972 int nfs4_sequence_done(struct rpc_task *task,
 973                        struct nfs4_sequence_res *res)
 974 {
 975         return nfs40_sequence_done(task, res);
 976 }
 977 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 978
 979 #endif  /* !CONFIG_NFS_V4_1 */
 980
 981 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
 982 {
 983         res->sr_timestamp = jiffies;
 984         res->sr_status_flags = 0;
 985         res->sr_status = 1;
 986 }
 987
 988 static
 989 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
 990                 struct nfs4_sequence_res *res,
 991                 struct nfs4_slot *slot)
 992 {
 993         if (!slot)
 994                 return;
 995         slot->privileged = args->sa_privileged ? 1 : 0;
 996         args->sa_slot = slot;
 997
 998         res->sr_slot = slot;
 999 }
1000
1001 int nfs4_setup_sequence(struct nfs_client *client,
1002                         struct nfs4_sequence_args *args,
1003                         struct nfs4_sequence_res *res,
1004                         struct rpc_task *task)
1005 {
1006         struct nfs4_session *session = nfs4_get_session(client);
1007         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1008         struct nfs4_slot *slot;
1009
1010         /* slot already allocated? */
1011         if (res->sr_slot != NULL)
1012                 goto out_start;
1013
1014         if (session)
1015                 tbl = &session->fc_slot_table;
1016
1017         spin_lock(&tbl->slot_tbl_lock);
1018         /* The state manager will wait until the slot table is empty */
1019         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1020                 goto out_sleep;
1021
1022         slot = nfs4_alloc_slot(tbl);
1023         if (IS_ERR(slot)) {
1024                 if (slot == ERR_PTR(-ENOMEM))
1025                         goto out_sleep_timeout;
1026                 goto out_sleep;
1027         }
1028         spin_unlock(&tbl->slot_tbl_lock);
1029
1030         nfs4_sequence_attach_slot(args, res, slot);
1031
1032         trace_nfs4_setup_sequence(session, args);
1033 out_start:
1034         nfs41_sequence_res_init(res);
1035         rpc_call_start(task);
1036         return 0;
1037 out_sleep_timeout:
1038         /* Try again in 1/4 second */
1039         if (args->sa_privileged)
1040                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1041                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1042         else
1043                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1044                                 NULL, jiffies + (HZ >> 2));
1045         spin_unlock(&tbl->slot_tbl_lock);
1046         return -EAGAIN;
1047 out_sleep:
1048         if (args->sa_privileged)
1049                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1050                                 RPC_PRIORITY_PRIVILEGED);
1051         else
1052                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1053         spin_unlock(&tbl->slot_tbl_lock);
1054         return -EAGAIN;
1055 }
1056 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1057
1058 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1059 {
1060         struct nfs4_call_sync_data *data = calldata;
1061         nfs4_setup_sequence(data->seq_server->nfs_client,
1062                                 data->seq_args, data->seq_res, task);
1063 }
1064
1065 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1066 {
1067         struct nfs4_call_sync_data *data = calldata;
1068         nfs4_sequence_done(task, data->seq_res);
1069 }
1070
1071 static const struct rpc_call_ops nfs40_call_sync_ops = {
1072         .rpc_call_prepare = nfs40_call_sync_prepare,
1073         .rpc_call_done = nfs40_call_sync_done,
1074 };
1075
1076 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1077                                    struct nfs_server *server,
1078                                    struct rpc_message *msg,
1079                                    struct nfs4_sequence_args *args,
1080                                    struct nfs4_sequence_res *res)
1081 {
1082         int ret;
1083         struct rpc_task *task;
1084         struct nfs_client *clp = server->nfs_client;
1085         struct nfs4_call_sync_data data = {
1086                 .seq_server = server,
1087                 .seq_args = args,
1088                 .seq_res = res,
1089         };
1090         struct rpc_task_setup task_setup = {
1091                 .rpc_client = clnt,
1092                 .rpc_message = msg,
1093                 .callback_ops = clp->cl_mvops->call_sync_ops,
1094                 .callback_data = &data
1095         };
1096
1097         task = rpc_run_task(&task_setup);
1098         if (IS_ERR(task))
1099                 ret = PTR_ERR(task);
1100         else {
1101                 ret = task->tk_status;
1102                 rpc_put_task(task);
1103         }
1104         return ret;
1105 }
1106
1107 int nfs4_call_sync(struct rpc_clnt *clnt,
1108                    struct nfs_server *server,
1109                    struct rpc_message *msg,
1110                    struct nfs4_sequence_args *args,
1111                    struct nfs4_sequence_res *res,
1112                    int cache_reply)
1113 {
1114         nfs4_init_sequence(args, res, cache_reply, 0);
1115         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1116 }
1117
1118 static void
1119 nfs4_inc_nlink_locked(struct inode *inode)
1120 {
1121         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
1122         inc_nlink(inode);
1123 }
1124
1125 static void
1126 nfs4_dec_nlink_locked(struct inode *inode)
1127 {
1128         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
1129         drop_nlink(inode);
1130 }
1131
1132 static void
1133 update_changeattr_locked(struct inode *dir, struct nfs4_change_info *cinfo,
1134                 unsigned long timestamp, unsigned long cache_validity)
1135 {
1136         struct nfs_inode *nfsi = NFS_I(dir);
1137
1138         nfsi->cache_validity |= NFS_INO_INVALID_CTIME
1139                 | NFS_INO_INVALID_MTIME
1140                 | NFS_INO_INVALID_DATA
1141                 | cache_validity;
1142         if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(dir)) {
1143                 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1144                 nfsi->attrtimeo_timestamp = jiffies;
1145         } else {
1146                 nfs_force_lookup_revalidate(dir);
1147                 if (cinfo->before != inode_peek_iversion_raw(dir))
1148                         nfsi->cache_validity |= NFS_INO_INVALID_ACCESS |
1149                                 NFS_INO_INVALID_ACL;
1150         }
1151         inode_set_iversion_raw(dir, cinfo->after);
1152         nfsi->read_cache_jiffies = timestamp;
1153         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1154         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1155         nfs_fscache_invalidate(dir);
1156 }
1157
1158 static void
1159 update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1160                 unsigned long timestamp, unsigned long cache_validity)
1161 {
1162         spin_lock(&dir->i_lock);
1163         update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1164         spin_unlock(&dir->i_lock);
1165 }
1166
1167 struct nfs4_open_createattrs {
1168         struct nfs4_label *label;
1169         struct iattr *sattr;
1170         const __u32 verf[2];
1171 };
1172
1173 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1174                 int err, struct nfs4_exception *exception)
1175 {
1176         if (err != -EINVAL)
1177                 return false;
1178         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1179                 return false;
1180         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1181         exception->retry = 1;
1182         return true;
1183 }
1184
1185 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1186 {
1187          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1188 }
1189
1190 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1191 {
1192         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1193
1194         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1195 }
1196
1197 static u32
1198 nfs4_map_atomic_open_share(struct nfs_server *server,
1199                 fmode_t fmode, int openflags)
1200 {
1201         u32 res = 0;
1202
1203         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1204         case FMODE_READ:
1205                 res = NFS4_SHARE_ACCESS_READ;
1206                 break;
1207         case FMODE_WRITE:
1208                 res = NFS4_SHARE_ACCESS_WRITE;
1209                 break;
1210         case FMODE_READ|FMODE_WRITE:
1211                 res = NFS4_SHARE_ACCESS_BOTH;
1212         }
1213         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1214                 goto out;
1215         /* Want no delegation if we're using O_DIRECT */
1216         if (openflags & O_DIRECT)
1217                 res |= NFS4_SHARE_WANT_NO_DELEG;
1218 out:
1219         return res;
1220 }
1221
1222 static enum open_claim_type4
1223 nfs4_map_atomic_open_claim(struct nfs_server *server,
1224                 enum open_claim_type4 claim)
1225 {
1226         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1227                 return claim;
1228         switch (claim) {
1229         default:
1230                 return claim;
1231         case NFS4_OPEN_CLAIM_FH:
1232                 return NFS4_OPEN_CLAIM_NULL;
1233         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1234                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1235         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1236                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1237         }
1238 }
1239
1240 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1241 {
1242         p->o_res.f_attr = &p->f_attr;
1243         p->o_res.f_label = p->f_label;
1244         p->o_res.seqid = p->o_arg.seqid;
1245         p->c_res.seqid = p->c_arg.seqid;
1246         p->o_res.server = p->o_arg.server;
1247         p->o_res.access_request = p->o_arg.access;
1248         nfs_fattr_init(&p->f_attr);
1249         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1250 }
1251
1252 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1253                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1254                 const struct nfs4_open_createattrs *c,
1255                 enum open_claim_type4 claim,
1256                 gfp_t gfp_mask)
1257 {
1258         struct dentry *parent = dget_parent(dentry);
1259         struct inode *dir = d_inode(parent);
1260         struct nfs_server *server = NFS_SERVER(dir);
1261         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1262         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1263         struct nfs4_opendata *p;
1264
1265         p = kzalloc(sizeof(*p), gfp_mask);
1266         if (p == NULL)
1267                 goto err;
1268
1269         p->f_label = nfs4_label_alloc(server, gfp_mask);
1270         if (IS_ERR(p->f_label))
1271                 goto err_free_p;
1272
1273         p->a_label = nfs4_label_alloc(server, gfp_mask);
1274         if (IS_ERR(p->a_label))
1275                 goto err_free_f;
1276
1277         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1278         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1279         if (IS_ERR(p->o_arg.seqid))
1280                 goto err_free_label;
1281         nfs_sb_active(dentry->d_sb);
1282         p->dentry = dget(dentry);
1283         p->dir = parent;
1284         p->owner = sp;
1285         atomic_inc(&sp->so_count);
1286         p->o_arg.open_flags = flags;
1287         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1288         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1289         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1290                         fmode, flags);
1291         if (flags & O_CREAT) {
1292                 p->o_arg.umask = current_umask();
1293                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1294                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1295                         p->o_arg.u.attrs = &p->attrs;
1296                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1297
1298                         memcpy(p->o_arg.u.verifier.data, c->verf,
1299                                         sizeof(p->o_arg.u.verifier.data));
1300                 }
1301         }
1302         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1303          * will return permission denied for all bits until close */
1304         if (!(flags & O_EXCL)) {
1305                 /* ask server to check for all possible rights as results
1306                  * are cached */
1307                 switch (p->o_arg.claim) {
1308                 default:
1309                         break;
1310                 case NFS4_OPEN_CLAIM_NULL:
1311                 case NFS4_OPEN_CLAIM_FH:
1312                         p->o_arg.access = NFS4_ACCESS_READ |
1313                                 NFS4_ACCESS_MODIFY |
1314                                 NFS4_ACCESS_EXTEND |
1315                                 NFS4_ACCESS_EXECUTE;
1316                 }
1317         }
1318         p->o_arg.clientid = server->nfs_client->cl_clientid;
1319         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1320         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1321         p->o_arg.name = &dentry->d_name;
1322         p->o_arg.server = server;
1323         p->o_arg.bitmask = nfs4_bitmask(server, label);
1324         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1325         switch (p->o_arg.claim) {
1326         case NFS4_OPEN_CLAIM_NULL:
1327         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1328         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1329                 p->o_arg.fh = NFS_FH(dir);
1330                 break;
1331         case NFS4_OPEN_CLAIM_PREVIOUS:
1332         case NFS4_OPEN_CLAIM_FH:
1333         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1334         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1335                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1336         }
1337         p->c_arg.fh = &p->o_res.fh;
1338         p->c_arg.stateid = &p->o_res.stateid;
1339         p->c_arg.seqid = p->o_arg.seqid;
1340         nfs4_init_opendata_res(p);
1341         kref_init(&p->kref);
1342         return p;
1343
1344 err_free_label:
1345         nfs4_label_free(p->a_label);
1346 err_free_f:
1347         nfs4_label_free(p->f_label);
1348 err_free_p:
1349         kfree(p);
1350 err:
1351         dput(parent);
1352         return NULL;
1353 }
1354
1355 static void nfs4_opendata_free(struct kref *kref)
1356 {
1357         struct nfs4_opendata *p = container_of(kref,
1358                         struct nfs4_opendata, kref);
1359         struct super_block *sb = p->dentry->d_sb;
1360
1361         nfs4_lgopen_release(p->lgp);
1362         nfs_free_seqid(p->o_arg.seqid);
1363         nfs4_sequence_free_slot(&p->o_res.seq_res);
1364         if (p->state != NULL)
1365                 nfs4_put_open_state(p->state);
1366         nfs4_put_state_owner(p->owner);
1367
1368         nfs4_label_free(p->a_label);
1369         nfs4_label_free(p->f_label);
1370
1371         dput(p->dir);
1372         dput(p->dentry);
1373         nfs_sb_deactive(sb);
1374         nfs_fattr_free_names(&p->f_attr);
1375         kfree(p->f_attr.mdsthreshold);
1376         kfree(p);
1377 }
1378
1379 static void nfs4_opendata_put(struct nfs4_opendata *p)
1380 {
1381         if (p != NULL)
1382                 kref_put(&p->kref, nfs4_opendata_free);
1383 }
1384
1385 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1386                 fmode_t fmode)
1387 {
1388         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1389         case FMODE_READ|FMODE_WRITE:
1390                 return state->n_rdwr != 0;
1391         case FMODE_WRITE:
1392                 return state->n_wronly != 0;
1393         case FMODE_READ:
1394                 return state->n_rdonly != 0;
1395         }
1396         WARN_ON_ONCE(1);
1397         return false;
1398 }
1399
1400 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1401                 int open_mode, enum open_claim_type4 claim)
1402 {
1403         int ret = 0;
1404
1405         if (open_mode & (O_EXCL|O_TRUNC))
1406                 goto out;
1407         switch (claim) {
1408         case NFS4_OPEN_CLAIM_NULL:
1409         case NFS4_OPEN_CLAIM_FH:
1410                 goto out;
1411         default:
1412                 break;
1413         }
1414         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1415                 case FMODE_READ:
1416                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1417                                 && state->n_rdonly != 0;
1418                         break;
1419                 case FMODE_WRITE:
1420                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1421                                 && state->n_wronly != 0;
1422                         break;
1423                 case FMODE_READ|FMODE_WRITE:
1424                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1425                                 && state->n_rdwr != 0;
1426         }
1427 out:
1428         return ret;
1429 }
1430
1431 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1432                 enum open_claim_type4 claim)
1433 {
1434         if (delegation == NULL)
1435                 return 0;
1436         if ((delegation->type & fmode) != fmode)
1437                 return 0;
1438         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1439                 return 0;
1440         switch (claim) {
1441         case NFS4_OPEN_CLAIM_NULL:
1442         case NFS4_OPEN_CLAIM_FH:
1443                 break;
1444         case NFS4_OPEN_CLAIM_PREVIOUS:
1445                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1446                         break;
1447                 /* Fall through */
1448         default:
1449                 return 0;
1450         }
1451         nfs_mark_delegation_referenced(delegation);
1452         return 1;
1453 }
1454
1455 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1456 {
1457         switch (fmode) {
1458                 case FMODE_WRITE:
1459                         state->n_wronly++;
1460                         break;
1461                 case FMODE_READ:
1462                         state->n_rdonly++;
1463                         break;
1464                 case FMODE_READ|FMODE_WRITE:
1465                         state->n_rdwr++;
1466         }
1467         nfs4_state_set_mode_locked(state, state->state | fmode);
1468 }
1469
1470 #ifdef CONFIG_NFS_V4_1
1471 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1472 {
1473         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1474                 return true;
1475         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1476                 return true;
1477         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1478                 return true;
1479         return false;
1480 }
1481 #endif /* CONFIG_NFS_V4_1 */
1482
1483 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1484 {
1485         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1486                 wake_up_all(&state->waitq);
1487 }
1488
1489 static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state,
1490                 const nfs4_stateid *stateid)
1491 {
1492         u32 state_seqid = be32_to_cpu(state->open_stateid.seqid);
1493         u32 stateid_seqid = be32_to_cpu(stateid->seqid);
1494
1495         if (stateid_seqid == state_seqid + 1U ||
1496             (stateid_seqid == 1U && state_seqid == 0xffffffffU))
1497                 nfs_state_log_update_open_stateid(state);
1498         else
1499                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1500 }
1501
1502 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1503 {
1504         struct nfs_client *clp = state->owner->so_server->nfs_client;
1505         bool need_recover = false;
1506
1507         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1508                 need_recover = true;
1509         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1510                 need_recover = true;
1511         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1512                 need_recover = true;
1513         if (need_recover)
1514                 nfs4_state_mark_reclaim_nograce(clp, state);
1515 }
1516
1517 /*
1518  * Check for whether or not the caller may update the open stateid
1519  * to the value passed in by stateid.
1520  *
1521  * Note: This function relies heavily on the server implementing
1522  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1523  * correctly.
1524  * i.e. The stateid seqids have to be initialised to 1, and
1525  * are then incremented on every state transition.
1526  */
1527 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1528                 const nfs4_stateid *stateid)
1529 {
1530         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 ||
1531             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1532                 if (stateid->seqid == cpu_to_be32(1))
1533                         nfs_state_log_update_open_stateid(state);
1534                 else
1535                         set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1536                 return true;
1537         }
1538
1539         if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1540                 nfs_state_log_out_of_order_open_stateid(state, stateid);
1541                 return true;
1542         }
1543         return false;
1544 }
1545
1546 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1547 {
1548         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1549                 return;
1550         if (state->n_wronly)
1551                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1552         if (state->n_rdonly)
1553                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1554         if (state->n_rdwr)
1555                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1556         set_bit(NFS_OPEN_STATE, &state->flags);
1557 }
1558
1559 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1560                 nfs4_stateid *stateid, fmode_t fmode)
1561 {
1562         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1563         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1564         case FMODE_WRITE:
1565                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1566                 break;
1567         case FMODE_READ:
1568                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1569                 break;
1570         case 0:
1571                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1572                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1573                 clear_bit(NFS_OPEN_STATE, &state->flags);
1574         }
1575         if (stateid == NULL)
1576                 return;
1577         /* Handle OPEN+OPEN_DOWNGRADE races */
1578         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1579             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1580                 nfs_resync_open_stateid_locked(state);
1581                 goto out;
1582         }
1583         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1584                 nfs4_stateid_copy(&state->stateid, stateid);
1585         nfs4_stateid_copy(&state->open_stateid, stateid);
1586         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1587 out:
1588         nfs_state_log_update_open_stateid(state);
1589 }
1590
1591 static void nfs_clear_open_stateid(struct nfs4_state *state,
1592         nfs4_stateid *arg_stateid,
1593         nfs4_stateid *stateid, fmode_t fmode)
1594 {
1595         write_seqlock(&state->seqlock);
1596         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1597         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1598                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1599         write_sequnlock(&state->seqlock);
1600         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1601                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1602 }
1603
1604 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1605                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1606         __must_hold(&state->owner->so_lock)
1607         __must_hold(&state->seqlock)
1608         __must_hold(RCU)
1609
1610 {
1611         DEFINE_WAIT(wait);
1612         int status = 0;
1613         for (;;) {
1614
1615                 if (!nfs_need_update_open_stateid(state, stateid))
1616                         return;
1617                 if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1618                         break;
1619                 if (status)
1620                         break;
1621                 /* Rely on seqids for serialisation with NFSv4.0 */
1622                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1623                         break;
1624
1625                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1626                 /*
1627                  * Ensure we process the state changes in the same order
1628                  * in which the server processed them by delaying the
1629                  * update of the stateid until we are in sequence.
1630                  */
1631                 write_sequnlock(&state->seqlock);
1632                 spin_unlock(&state->owner->so_lock);
1633                 rcu_read_unlock();
1634                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1635                 if (!signal_pending(current)) {
1636                         if (schedule_timeout(5*HZ) == 0)
1637                                 status = -EAGAIN;
1638                         else
1639                                 status = 0;
1640                 } else
1641                         status = -EINTR;
1642                 finish_wait(&state->waitq, &wait);
1643                 rcu_read_lock();
1644                 spin_lock(&state->owner->so_lock);
1645                 write_seqlock(&state->seqlock);
1646         }
1647
1648         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1649             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1650                 nfs4_stateid_copy(freeme, &state->open_stateid);
1651                 nfs_test_and_clear_all_open_stateid(state);
1652         }
1653
1654         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1655                 nfs4_stateid_copy(&state->stateid, stateid);
1656         nfs4_stateid_copy(&state->open_stateid, stateid);
1657         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1658         nfs_state_log_update_open_stateid(state);
1659 }
1660
1661 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1662                 const nfs4_stateid *open_stateid,
1663                 fmode_t fmode,
1664                 nfs4_stateid *freeme)
1665 {
1666         /*
1667          * Protect the call to nfs4_state_set_mode_locked and
1668          * serialise the stateid update
1669          */
1670         write_seqlock(&state->seqlock);
1671         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1672         switch (fmode) {
1673         case FMODE_READ:
1674                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1675                 break;
1676         case FMODE_WRITE:
1677                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1678                 break;
1679         case FMODE_READ|FMODE_WRITE:
1680                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1681         }
1682         set_bit(NFS_OPEN_STATE, &state->flags);
1683         write_sequnlock(&state->seqlock);
1684 }
1685
1686 static void nfs_state_set_delegation(struct nfs4_state *state,
1687                 const nfs4_stateid *deleg_stateid,
1688                 fmode_t fmode)
1689 {
1690         /*
1691          * Protect the call to nfs4_state_set_mode_locked and
1692          * serialise the stateid update
1693          */
1694         write_seqlock(&state->seqlock);
1695         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1696         set_bit(NFS_DELEGATED_STATE, &state->flags);
1697         write_sequnlock(&state->seqlock);
1698 }
1699
1700 static void nfs_state_clear_delegation(struct nfs4_state *state)
1701 {
1702         write_seqlock(&state->seqlock);
1703         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1704         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1705         write_sequnlock(&state->seqlock);
1706 }
1707
1708 static int update_open_stateid(struct nfs4_state *state,
1709                 const nfs4_stateid *open_stateid,
1710                 const nfs4_stateid *delegation,
1711                 fmode_t fmode)
1712 {
1713         struct nfs_server *server = NFS_SERVER(state->inode);
1714         struct nfs_client *clp = server->nfs_client;
1715         struct nfs_inode *nfsi = NFS_I(state->inode);
1716         struct nfs_delegation *deleg_cur;
1717         nfs4_stateid freeme = { };
1718         int ret = 0;
1719
1720         fmode &= (FMODE_READ|FMODE_WRITE);
1721
1722         rcu_read_lock();
1723         spin_lock(&state->owner->so_lock);
1724         if (open_stateid != NULL) {
1725                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1726                 ret = 1;
1727         }
1728
1729         deleg_cur = rcu_dereference(nfsi->delegation);
1730         if (deleg_cur == NULL)
1731                 goto no_delegation;
1732
1733         spin_lock(&deleg_cur->lock);
1734         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1735            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1736             (deleg_cur->type & fmode) != fmode)
1737                 goto no_delegation_unlock;
1738
1739         if (delegation == NULL)
1740                 delegation = &deleg_cur->stateid;
1741         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1742                 goto no_delegation_unlock;
1743
1744         nfs_mark_delegation_referenced(deleg_cur);
1745         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1746         ret = 1;
1747 no_delegation_unlock:
1748         spin_unlock(&deleg_cur->lock);
1749 no_delegation:
1750         if (ret)
1751                 update_open_stateflags(state, fmode);
1752         spin_unlock(&state->owner->so_lock);
1753         rcu_read_unlock();
1754
1755         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1756                 nfs4_schedule_state_manager(clp);
1757         if (freeme.type != 0)
1758                 nfs4_test_and_free_stateid(server, &freeme,
1759                                 state->owner->so_cred);
1760
1761         return ret;
1762 }
1763
1764 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1765                 const nfs4_stateid *stateid)
1766 {
1767         struct nfs4_state *state = lsp->ls_state;
1768         bool ret = false;
1769
1770         spin_lock(&state->state_lock);
1771         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1772                 goto out_noupdate;
1773         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1774                 goto out_noupdate;
1775         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1776         ret = true;
1777 out_noupdate:
1778         spin_unlock(&state->state_lock);
1779         return ret;
1780 }
1781
1782 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1783 {
1784         struct nfs_delegation *delegation;
1785
1786         fmode &= FMODE_READ|FMODE_WRITE;
1787         rcu_read_lock();
1788         delegation = rcu_dereference(NFS_I(inode)->delegation);
1789         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1790                 rcu_read_unlock();
1791                 return;
1792         }
1793         rcu_read_unlock();
1794         nfs4_inode_return_delegation(inode);
1795 }
1796
1797 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1798 {
1799         struct nfs4_state *state = opendata->state;
1800         struct nfs_inode *nfsi = NFS_I(state->inode);
1801         struct nfs_delegation *delegation;
1802         int open_mode = opendata->o_arg.open_flags;
1803         fmode_t fmode = opendata->o_arg.fmode;
1804         enum open_claim_type4 claim = opendata->o_arg.claim;
1805         nfs4_stateid stateid;
1806         int ret = -EAGAIN;
1807
1808         for (;;) {
1809                 spin_lock(&state->owner->so_lock);
1810                 if (can_open_cached(state, fmode, open_mode, claim)) {
1811                         update_open_stateflags(state, fmode);
1812                         spin_unlock(&state->owner->so_lock);
1813                         goto out_return_state;
1814                 }
1815                 spin_unlock(&state->owner->so_lock);
1816                 rcu_read_lock();
1817                 delegation = rcu_dereference(nfsi->delegation);
1818                 if (!can_open_delegated(delegation, fmode, claim)) {
1819                         rcu_read_unlock();
1820                         break;
1821                 }
1822                 /* Save the delegation */
1823                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1824                 rcu_read_unlock();
1825                 nfs_release_seqid(opendata->o_arg.seqid);
1826                 if (!opendata->is_recover) {
1827                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1828                         if (ret != 0)
1829                                 goto out;
1830                 }
1831                 ret = -EAGAIN;
1832
1833                 /* Try to update the stateid using the delegation */
1834                 if (update_open_stateid(state, NULL, &stateid, fmode))
1835                         goto out_return_state;
1836         }
1837 out:
1838         return ERR_PTR(ret);
1839 out_return_state:
1840         refcount_inc(&state->count);
1841         return state;
1842 }
1843
1844 static void
1845 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1846 {
1847         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1848         struct nfs_delegation *delegation;
1849         int delegation_flags = 0;
1850
1851         rcu_read_lock();
1852         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1853         if (delegation)
1854                 delegation_flags = delegation->flags;
1855         rcu_read_unlock();
1856         switch (data->o_arg.claim) {
1857         default:
1858                 break;
1859         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1860         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1861                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1862                                    "returning a delegation for "
1863                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1864                                    clp->cl_hostname);
1865                 return;
1866         }
1867         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1868                 nfs_inode_set_delegation(state->inode,
1869                                 data->owner->so_cred,
1870                                 data->o_res.delegation_type,
1871                                 &data->o_res.delegation,
1872                                 data->o_res.pagemod_limit);
1873         else
1874                 nfs_inode_reclaim_delegation(state->inode,
1875                                 data->owner->so_cred,
1876                                 data->o_res.delegation_type,
1877                                 &data->o_res.delegation,
1878                                 data->o_res.pagemod_limit);
1879
1880         if (data->o_res.do_recall)
1881                 nfs_async_inode_return_delegation(state->inode,
1882                                                   &data->o_res.delegation);
1883 }
1884
1885 /*
1886  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1887  * and update the nfs4_state.
1888  */
1889 static struct nfs4_state *
1890 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1891 {
1892         struct inode *inode = data->state->inode;
1893         struct nfs4_state *state = data->state;
1894         int ret;
1895
1896         if (!data->rpc_done) {
1897                 if (data->rpc_status)
1898                         return ERR_PTR(data->rpc_status);
1899                 /* cached opens have already been processed */
1900                 goto update;
1901         }
1902
1903         ret = nfs_refresh_inode(inode, &data->f_attr);
1904         if (ret)
1905                 return ERR_PTR(ret);
1906
1907         if (data->o_res.delegation_type != 0)
1908                 nfs4_opendata_check_deleg(data, state);
1909 update:
1910         update_open_stateid(state, &data->o_res.stateid, NULL,
1911                             data->o_arg.fmode);
1912         refcount_inc(&state->count);
1913
1914         return state;
1915 }
1916
1917 static struct inode *
1918 nfs4_opendata_get_inode(struct nfs4_opendata *data)
1919 {
1920         struct inode *inode;
1921
1922         switch (data->o_arg.claim) {
1923         case NFS4_OPEN_CLAIM_NULL:
1924         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1925         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1926                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1927                         return ERR_PTR(-EAGAIN);
1928                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
1929                                 &data->f_attr, data->f_label);
1930                 break;
1931         default:
1932                 inode = d_inode(data->dentry);
1933                 ihold(inode);
1934                 nfs_refresh_inode(inode, &data->f_attr);
1935         }
1936         return inode;
1937 }
1938
1939 static struct nfs4_state *
1940 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
1941 {
1942         struct nfs4_state *state;
1943         struct inode *inode;
1944
1945         inode = nfs4_opendata_get_inode(data);
1946         if (IS_ERR(inode))
1947                 return ERR_CAST(inode);
1948         if (data->state != NULL && data->state->inode == inode) {
1949                 state = data->state;
1950                 refcount_inc(&state->count);
1951         } else
1952                 state = nfs4_get_open_state(inode, data->owner);
1953         iput(inode);
1954         if (state == NULL)
1955                 state = ERR_PTR(-ENOMEM);
1956         return state;
1957 }
1958
1959 static struct nfs4_state *
1960 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1961 {
1962         struct nfs4_state *state;
1963
1964         if (!data->rpc_done) {
1965                 state = nfs4_try_open_cached(data);
1966                 trace_nfs4_cached_open(data->state);
1967                 goto out;
1968         }
1969
1970         state = nfs4_opendata_find_nfs4_state(data);
1971         if (IS_ERR(state))
1972                 goto out;
1973
1974         if (data->o_res.delegation_type != 0)
1975                 nfs4_opendata_check_deleg(data, state);
1976         update_open_stateid(state, &data->o_res.stateid, NULL,
1977                         data->o_arg.fmode);
1978 out:
1979         nfs_release_seqid(data->o_arg.seqid);
1980         return state;
1981 }
1982
1983 static struct nfs4_state *
1984 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1985 {
1986         struct nfs4_state *ret;
1987
1988         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1989                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
1990         else
1991                 ret = _nfs4_opendata_to_nfs4_state(data);
1992         nfs4_sequence_free_slot(&data->o_res.seq_res);
1993         return ret;
1994 }
1995
1996 static struct nfs_open_context *
1997 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
1998 {
1999         struct nfs_inode *nfsi = NFS_I(state->inode);
2000         struct nfs_open_context *ctx;
2001
2002         rcu_read_lock();
2003         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2004                 if (ctx->state != state)
2005                         continue;
2006                 if ((ctx->mode & mode) != mode)
2007                         continue;
2008                 if (!get_nfs_open_context(ctx))
2009                         continue;
2010                 rcu_read_unlock();
2011                 return ctx;
2012         }
2013         rcu_read_unlock();
2014         return ERR_PTR(-ENOENT);
2015 }
2016
2017 static struct nfs_open_context *
2018 nfs4_state_find_open_context(struct nfs4_state *state)
2019 {
2020         struct nfs_open_context *ctx;
2021
2022         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2023         if (!IS_ERR(ctx))
2024                 return ctx;
2025         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2026         if (!IS_ERR(ctx))
2027                 return ctx;
2028         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2029 }
2030
2031 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2032                 struct nfs4_state *state, enum open_claim_type4 claim)
2033 {
2034         struct nfs4_opendata *opendata;
2035
2036         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2037                         NULL, claim, GFP_NOFS);
2038         if (opendata == NULL)
2039                 return ERR_PTR(-ENOMEM);
2040         opendata->state = state;
2041         refcount_inc(&state->count);
2042         return opendata;
2043 }
2044
2045 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2046                 fmode_t fmode)
2047 {
2048         struct nfs4_state *newstate;
2049         int ret;
2050
2051         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2052                 return 0;
2053         opendata->o_arg.open_flags = 0;
2054         opendata->o_arg.fmode = fmode;
2055         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
2056                         NFS_SB(opendata->dentry->d_sb),
2057                         fmode, 0);
2058         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2059         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2060         nfs4_init_opendata_res(opendata);
2061         ret = _nfs4_recover_proc_open(opendata);
2062         if (ret != 0)
2063                 return ret;
2064         newstate = nfs4_opendata_to_nfs4_state(opendata);
2065         if (IS_ERR(newstate))
2066                 return PTR_ERR(newstate);
2067         if (newstate != opendata->state)
2068                 ret = -ESTALE;
2069         nfs4_close_state(newstate, fmode);
2070         return ret;
2071 }
2072
2073 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2074 {
2075         int ret;
2076
2077         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
2078         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2079         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2080         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2081         /* memory barrier prior to reading state->n_* */
2082         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2083         clear_bit(NFS_OPEN_STATE, &state->flags);
2084         smp_rmb();
2085         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2086         if (ret != 0)
2087                 return ret;
2088         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2089         if (ret != 0)
2090                 return ret;
2091         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2092         if (ret != 0)
2093                 return ret;
2094         /*
2095          * We may have performed cached opens for all three recoveries.
2096          * Check if we need to update the current stateid.
2097          */
2098         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2099             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2100                 write_seqlock(&state->seqlock);
2101                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2102                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2103                 write_sequnlock(&state->seqlock);
2104         }
2105         return 0;
2106 }
2107
2108 /*
2109  * OPEN_RECLAIM:
2110  *      reclaim state on the server after a reboot.
2111  */
2112 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2113 {
2114         struct nfs_delegation *delegation;
2115         struct nfs4_opendata *opendata;
2116         fmode_t delegation_type = 0;
2117         int status;
2118
2119         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2120                         NFS4_OPEN_CLAIM_PREVIOUS);
2121         if (IS_ERR(opendata))
2122                 return PTR_ERR(opendata);
2123         rcu_read_lock();
2124         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2125         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2126                 delegation_type = delegation->type;
2127         rcu_read_unlock();
2128         opendata->o_arg.u.delegation_type = delegation_type;
2129         status = nfs4_open_recover(opendata, state);
2130         nfs4_opendata_put(opendata);
2131         return status;
2132 }
2133
2134 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2135 {
2136         struct nfs_server *server = NFS_SERVER(state->inode);
2137         struct nfs4_exception exception = { };
2138         int err;
2139         do {
2140                 err = _nfs4_do_open_reclaim(ctx, state);
2141                 trace_nfs4_open_reclaim(ctx, 0, err);
2142                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2143                         continue;
2144                 if (err != -NFS4ERR_DELAY)
2145                         break;
2146                 nfs4_handle_exception(server, err, &exception);
2147         } while (exception.retry);
2148         return err;
2149 }
2150
2151 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2152 {
2153         struct nfs_open_context *ctx;
2154         int ret;
2155
2156         ctx = nfs4_state_find_open_context(state);
2157         if (IS_ERR(ctx))
2158                 return -EAGAIN;
2159         ret = nfs4_do_open_reclaim(ctx, state);
2160         put_nfs_open_context(ctx);
2161         return ret;
2162 }
2163
2164 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2165 {
2166         switch (err) {
2167                 default:
2168                         printk(KERN_ERR "NFS: %s: unhandled error "
2169                                         "%d.\n", __func__, err);
2170                 case 0:
2171                 case -ENOENT:
2172                 case -EAGAIN:
2173                 case -ESTALE:
2174                         break;
2175                 case -NFS4ERR_BADSESSION:
2176                 case -NFS4ERR_BADSLOT:
2177                 case -NFS4ERR_BAD_HIGH_SLOT:
2178                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2179                 case -NFS4ERR_DEADSESSION:
2180                         set_bit(NFS_DELEGATED_STATE, &state->flags);
2181                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
2182                         return -EAGAIN;
2183                 case -NFS4ERR_STALE_CLIENTID:
2184                 case -NFS4ERR_STALE_STATEID:
2185                         set_bit(NFS_DELEGATED_STATE, &state->flags);
2186                         /* Don't recall a delegation if it was lost */
2187                         nfs4_schedule_lease_recovery(server->nfs_client);
2188                         return -EAGAIN;
2189                 case -NFS4ERR_MOVED:
2190                         nfs4_schedule_migration_recovery(server);
2191                         return -EAGAIN;
2192                 case -NFS4ERR_LEASE_MOVED:
2193                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2194                         return -EAGAIN;
2195                 case -NFS4ERR_DELEG_REVOKED:
2196                 case -NFS4ERR_ADMIN_REVOKED:
2197                 case -NFS4ERR_EXPIRED:
2198                 case -NFS4ERR_BAD_STATEID:
2199                 case -NFS4ERR_OPENMODE:
2200                         nfs_inode_find_state_and_recover(state->inode,
2201                                         stateid);
2202                         nfs4_schedule_stateid_recovery(server, state);
2203                         return -EAGAIN;
2204                 case -NFS4ERR_DELAY:
2205                 case -NFS4ERR_GRACE:
2206                         set_bit(NFS_DELEGATED_STATE, &state->flags);
2207                         ssleep(1);
2208                         return -EAGAIN;
2209                 case -ENOMEM:
2210                 case -NFS4ERR_DENIED:
2211                         if (fl) {
2212                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2213                                 if (lsp)
2214                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2215                         }
2216                         return 0;
2217         }
2218         return err;
2219 }
2220
2221 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2222                 struct nfs4_state *state, const nfs4_stateid *stateid,
2223                 fmode_t type)
2224 {
2225         struct nfs_server *server = NFS_SERVER(state->inode);
2226         struct nfs4_opendata *opendata;
2227         int err = 0;
2228
2229         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2230                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2231         if (IS_ERR(opendata))
2232                 return PTR_ERR(opendata);
2233         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2234         nfs_state_clear_delegation(state);
2235         switch (type & (FMODE_READ|FMODE_WRITE)) {
2236         case FMODE_READ|FMODE_WRITE:
2237         case FMODE_WRITE:
2238                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2239                 if (err)
2240                         break;
2241                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2242                 if (err)
2243                         break;
2244                 /* Fall through */
2245         case FMODE_READ:
2246                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2247         }
2248         nfs4_opendata_put(opendata);
2249         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2250 }
2251
2252 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2253 {
2254         struct nfs4_opendata *data = calldata;
2255
2256         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2257                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2258 }
2259
2260 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2261 {
2262         struct nfs4_opendata *data = calldata;
2263
2264         nfs40_sequence_done(task, &data->c_res.seq_res);
2265
2266         data->rpc_status = task->tk_status;
2267         if (data->rpc_status == 0) {
2268                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2269                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2270                 renew_lease(data->o_res.server, data->timestamp);
2271                 data->rpc_done = true;
2272         }
2273 }
2274
2275 static void nfs4_open_confirm_release(void *calldata)
2276 {
2277         struct nfs4_opendata *data = calldata;
2278         struct nfs4_state *state = NULL;
2279
2280         /* If this request hasn't been cancelled, do nothing */
2281         if (!data->cancelled)
2282                 goto out_free;
2283         /* In case of error, no cleanup! */
2284         if (!data->rpc_done)
2285                 goto out_free;
2286         state = nfs4_opendata_to_nfs4_state(data);
2287         if (!IS_ERR(state))
2288                 nfs4_close_state(state, data->o_arg.fmode);
2289 out_free:
2290         nfs4_opendata_put(data);
2291 }
2292
2293 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2294         .rpc_call_prepare = nfs4_open_confirm_prepare,
2295         .rpc_call_done = nfs4_open_confirm_done,
2296         .rpc_release = nfs4_open_confirm_release,
2297 };
2298
2299 /*
2300  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2301  */
2302 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2303 {
2304         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2305         struct rpc_task *task;
2306         struct  rpc_message msg = {
2307                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2308                 .rpc_argp = &data->c_arg,
2309                 .rpc_resp = &data->c_res,
2310                 .rpc_cred = data->owner->so_cred,
2311         };
2312         struct rpc_task_setup task_setup_data = {
2313                 .rpc_client = server->client,
2314                 .rpc_message = &msg,
2315                 .callback_ops = &nfs4_open_confirm_ops,
2316                 .callback_data = data,
2317                 .workqueue = nfsiod_workqueue,
2318                 .flags = RPC_TASK_ASYNC,
2319         };
2320         int status;
2321
2322         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2323                                 data->is_recover);
2324         kref_get(&data->kref);
2325         data->rpc_done = false;
2326         data->rpc_status = 0;
2327         data->timestamp = jiffies;
2328         task = rpc_run_task(&task_setup_data);
2329         if (IS_ERR(task))
2330                 return PTR_ERR(task);
2331         status = rpc_wait_for_completion_task(task);
2332         if (status != 0) {
2333                 data->cancelled = true;
2334                 smp_wmb();
2335         } else
2336                 status = data->rpc_status;
2337         rpc_put_task(task);
2338         return status;
2339 }
2340
2341 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2342 {
2343         struct nfs4_opendata *data = calldata;
2344         struct nfs4_state_owner *sp = data->owner;
2345         struct nfs_client *clp = sp->so_server->nfs_client;
2346         enum open_claim_type4 claim = data->o_arg.claim;
2347
2348         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2349                 goto out_wait;
2350         /*
2351          * Check if we still need to send an OPEN call, or if we can use
2352          * a delegation instead.
2353          */
2354         if (data->state != NULL) {
2355                 struct nfs_delegation *delegation;
2356
2357                 if (can_open_cached(data->state, data->o_arg.fmode,
2358                                         data->o_arg.open_flags, claim))
2359                         goto out_no_action;
2360                 rcu_read_lock();
2361                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
2362                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2363                         goto unlock_no_action;
2364                 rcu_read_unlock();
2365         }
2366         /* Update client id. */
2367         data->o_arg.clientid = clp->cl_clientid;
2368         switch (claim) {
2369         default:
2370                 break;
2371         case NFS4_OPEN_CLAIM_PREVIOUS:
2372         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2373         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2374                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2375                 /* Fall through */
2376         case NFS4_OPEN_CLAIM_FH:
2377                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2378         }
2379         data->timestamp = jiffies;
2380         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2381                                 &data->o_arg.seq_args,
2382                                 &data->o_res.seq_res,
2383                                 task) != 0)
2384                 nfs_release_seqid(data->o_arg.seqid);
2385
2386         /* Set the create mode (note dependency on the session type) */
2387         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2388         if (data->o_arg.open_flags & O_EXCL) {
2389                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2390                 if (nfs4_has_persistent_session(clp))
2391                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2392                 else if (clp->cl_mvops->minor_version > 0)
2393                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2394         }
2395         return;
2396 unlock_no_action:
2397         trace_nfs4_cached_open(data->state);
2398         rcu_read_unlock();
2399 out_no_action:
2400         task->tk_action = NULL;
2401 out_wait:
2402         nfs4_sequence_done(task, &data->o_res.seq_res);
2403 }
2404
2405 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2406 {
2407         struct nfs4_opendata *data = calldata;
2408
2409         data->rpc_status = task->tk_status;
2410
2411         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2412                 return;
2413
2414         if (task->tk_status == 0) {
2415                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2416                         switch (data->o_res.f_attr->mode & S_IFMT) {
2417                         case S_IFREG:
2418                                 break;
2419                         case S_IFLNK:
2420                                 data->rpc_status = -ELOOP;
2421                                 break;
2422                         case S_IFDIR:
2423                                 data->rpc_status = -EISDIR;
2424                                 break;
2425                         default:
2426                                 data->rpc_status = -ENOTDIR;
2427                         }
2428                 }
2429                 renew_lease(data->o_res.server, data->timestamp);
2430                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2431                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2432         }
2433         data->rpc_done = true;
2434 }
2435
2436 static void nfs4_open_release(void *calldata)
2437 {
2438         struct nfs4_opendata *data = calldata;
2439         struct nfs4_state *state = NULL;
2440
2441         /* If this request hasn't been cancelled, do nothing */
2442         if (!data->cancelled)
2443                 goto out_free;
2444         /* In case of error, no cleanup! */
2445         if (data->rpc_status != 0 || !data->rpc_done)
2446                 goto out_free;
2447         /* In case we need an open_confirm, no cleanup! */
2448         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2449                 goto out_free;
2450         state = nfs4_opendata_to_nfs4_state(data);
2451         if (!IS_ERR(state))
2452                 nfs4_close_state(state, data->o_arg.fmode);
2453 out_free:
2454         nfs4_opendata_put(data);
2455 }
2456
2457 static const struct rpc_call_ops nfs4_open_ops = {
2458         .rpc_call_prepare = nfs4_open_prepare,
2459         .rpc_call_done = nfs4_open_done,
2460         .rpc_release = nfs4_open_release,
2461 };
2462
2463 static int nfs4_run_open_task(struct nfs4_opendata *data,
2464                               struct nfs_open_context *ctx)
2465 {
2466         struct inode *dir = d_inode(data->dir);
2467         struct nfs_server *server = NFS_SERVER(dir);
2468         struct nfs_openargs *o_arg = &data->o_arg;
2469         struct nfs_openres *o_res = &data->o_res;
2470         struct rpc_task *task;
2471         struct rpc_message msg = {
2472                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2473                 .rpc_argp = o_arg,
2474                 .rpc_resp = o_res,
2475                 .rpc_cred = data->owner->so_cred,
2476         };
2477         struct rpc_task_setup task_setup_data = {
2478                 .rpc_client = server->client,
2479                 .rpc_message = &msg,
2480                 .callback_ops = &nfs4_open_ops,
2481                 .callback_data = data,
2482                 .workqueue = nfsiod_workqueue,
2483                 .flags = RPC_TASK_ASYNC,
2484         };
2485         int status;
2486
2487         kref_get(&data->kref);
2488         data->rpc_done = false;
2489         data->rpc_status = 0;
2490         data->cancelled = false;
2491         data->is_recover = false;
2492         if (!ctx) {
2493                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2494                 data->is_recover = true;
2495         } else {
2496                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2497                 pnfs_lgopen_prepare(data, ctx);
2498         }
2499         task = rpc_run_task(&task_setup_data);
2500         if (IS_ERR(task))
2501                 return PTR_ERR(task);
2502         status = rpc_wait_for_completion_task(task);
2503         if (status != 0) {
2504                 data->cancelled = true;
2505                 smp_wmb();
2506         } else
2507                 status = data->rpc_status;
2508         rpc_put_task(task);
2509
2510         return status;
2511 }
2512
2513 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2514 {
2515         struct inode *dir = d_inode(data->dir);
2516         struct nfs_openres *o_res = &data->o_res;
2517         int status;
2518
2519         status = nfs4_run_open_task(data, NULL);
2520         if (status != 0 || !data->rpc_done)
2521                 return status;
2522
2523         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2524
2525         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2526                 status = _nfs4_proc_open_confirm(data);
2527
2528         return status;
2529 }
2530
2531 /*
2532  * Additional permission checks in order to distinguish between an
2533  * open for read, and an open for execute. This works around the
2534  * fact that NFSv4 OPEN treats read and execute permissions as being
2535  * the same.
2536  * Note that in the non-execute case, we want to turn off permission
2537  * checking if we just created a new file (POSIX open() semantics).
2538  */
2539 static int nfs4_opendata_access(const struct cred *cred,
2540                                 struct nfs4_opendata *opendata,
2541                                 struct nfs4_state *state, fmode_t fmode,
2542                                 int openflags)
2543 {
2544         struct nfs_access_entry cache;
2545         u32 mask, flags;
2546
2547         /* access call failed or for some reason the server doesn't
2548          * support any access modes -- defer access call until later */
2549         if (opendata->o_res.access_supported == 0)
2550                 return 0;
2551
2552         mask = 0;
2553         /*
2554          * Use openflags to check for exec, because fmode won't
2555          * always have FMODE_EXEC set when file open for exec.
2556          */
2557         if (openflags & __FMODE_EXEC) {
2558                 /* ONLY check for exec rights */
2559                 if (S_ISDIR(state->inode->i_mode))
2560                         mask = NFS4_ACCESS_LOOKUP;
2561                 else
2562                         mask = NFS4_ACCESS_EXECUTE;
2563         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2564                 mask = NFS4_ACCESS_READ;
2565
2566         cache.cred = cred;
2567         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2568         nfs_access_add_cache(state->inode, &cache);
2569
2570         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2571         if ((mask & ~cache.mask & flags) == 0)
2572                 return 0;
2573
2574         return -EACCES;
2575 }
2576
2577 /*
2578  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2579  */
2580 static int _nfs4_proc_open(struct nfs4_opendata *data,
2581                            struct nfs_open_context *ctx)
2582 {
2583         struct inode *dir = d_inode(data->dir);
2584         struct nfs_server *server = NFS_SERVER(dir);
2585         struct nfs_openargs *o_arg = &data->o_arg;
2586         struct nfs_openres *o_res = &data->o_res;
2587         int status;
2588
2589         status = nfs4_run_open_task(data, ctx);
2590         if (!data->rpc_done)
2591                 return status;
2592         if (status != 0) {
2593                 if (status == -NFS4ERR_BADNAME &&
2594                                 !(o_arg->open_flags & O_CREAT))
2595                         return -ENOENT;
2596                 return status;
2597         }
2598
2599         nfs_fattr_map_and_free_names(server, &data->f_attr);
2600
2601         if (o_arg->open_flags & O_CREAT) {
2602                 if (o_arg->open_flags & O_EXCL)
2603                         data->file_created = true;
2604                 else if (o_res->cinfo.before != o_res->cinfo.after)
2605                         data->file_created = true;
2606                 if (data->file_created ||
2607                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2608                         update_changeattr(dir, &o_res->cinfo,
2609                                         o_res->f_attr->time_start, 0);
2610         }
2611         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2612                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2613         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2614                 status = _nfs4_proc_open_confirm(data);
2615                 if (status != 0)
2616                         return status;
2617         }
2618         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2619                 nfs4_sequence_free_slot(&o_res->seq_res);
2620                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr,
2621                                 o_res->f_label, NULL);
2622         }
2623         return 0;
2624 }
2625
2626 /*
2627  * OPEN_EXPIRED:
2628  *      reclaim state on the server after a network partition.
2629  *      Assumes caller holds the appropriate lock
2630  */
2631 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2632 {
2633         struct nfs4_opendata *opendata;
2634         int ret;
2635
2636         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2637                         NFS4_OPEN_CLAIM_FH);
2638         if (IS_ERR(opendata))
2639                 return PTR_ERR(opendata);
2640         ret = nfs4_open_recover(opendata, state);
2641         if (ret == -ESTALE)
2642                 d_drop(ctx->dentry);
2643         nfs4_opendata_put(opendata);
2644         return ret;
2645 }
2646
2647 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2648 {
2649         struct nfs_server *server = NFS_SERVER(state->inode);
2650         struct nfs4_exception exception = { };
2651         int err;
2652
2653         do {
2654                 err = _nfs4_open_expired(ctx, state);
2655                 trace_nfs4_open_expired(ctx, 0, err);
2656                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2657                         continue;
2658                 switch (err) {
2659                 default:
2660                         goto out;
2661                 case -NFS4ERR_GRACE:
2662                 case -NFS4ERR_DELAY:
2663                         nfs4_handle_exception(server, err, &exception);
2664                         err = 0;
2665                 }
2666         } while (exception.retry);
2667 out:
2668         return err;
2669 }
2670
2671 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2672 {
2673         struct nfs_open_context *ctx;
2674         int ret;
2675
2676         ctx = nfs4_state_find_open_context(state);
2677         if (IS_ERR(ctx))
2678                 return -EAGAIN;
2679         ret = nfs4_do_open_expired(ctx, state);
2680         put_nfs_open_context(ctx);
2681         return ret;
2682 }
2683
2684 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2685                 const nfs4_stateid *stateid)
2686 {
2687         nfs_remove_bad_delegation(state->inode, stateid);
2688         nfs_state_clear_delegation(state);
2689 }
2690
2691 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2692 {
2693         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2694                 nfs_finish_clear_delegation_stateid(state, NULL);
2695 }
2696
2697 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2698 {
2699         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2700         nfs40_clear_delegation_stateid(state);
2701         return nfs4_open_expired(sp, state);
2702 }
2703
2704 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2705                 nfs4_stateid *stateid,
2706                 const struct cred *cred)
2707 {
2708         return -NFS4ERR_BAD_STATEID;
2709 }
2710
2711 #if defined(CONFIG_NFS_V4_1)
2712 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2713                 nfs4_stateid *stateid,
2714                 const struct cred *cred)
2715 {
2716         int status;
2717
2718         switch (stateid->type) {
2719         default:
2720                 break;
2721         case NFS4_INVALID_STATEID_TYPE:
2722         case NFS4_SPECIAL_STATEID_TYPE:
2723                 return -NFS4ERR_BAD_STATEID;
2724         case NFS4_REVOKED_STATEID_TYPE:
2725                 goto out_free;
2726         }
2727
2728         status = nfs41_test_stateid(server, stateid, cred);
2729         switch (status) {
2730         case -NFS4ERR_EXPIRED:
2731         case -NFS4ERR_ADMIN_REVOKED:
2732         case -NFS4ERR_DELEG_REVOKED:
2733                 break;
2734         default:
2735                 return status;
2736         }
2737 out_free:
2738         /* Ack the revoked state to the server */
2739         nfs41_free_stateid(server, stateid, cred, true);
2740         return -NFS4ERR_EXPIRED;
2741 }
2742
2743 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2744 {
2745         struct nfs_server *server = NFS_SERVER(state->inode);
2746         nfs4_stateid stateid;
2747         struct nfs_delegation *delegation;
2748         const struct cred *cred = NULL;
2749         int status;
2750
2751         /* Get the delegation credential for use by test/free_stateid */
2752         rcu_read_lock();
2753         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2754         if (delegation == NULL) {
2755                 rcu_read_unlock();
2756                 nfs_state_clear_delegation(state);
2757                 return;
2758         }
2759
2760         nfs4_stateid_copy(&stateid, &delegation->stateid);
2761         if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) {
2762                 rcu_read_unlock();
2763                 nfs_state_clear_delegation(state);
2764                 return;
2765         }
2766
2767         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2768                                 &delegation->flags)) {
2769                 rcu_read_unlock();
2770                 return;
2771         }
2772
2773         if (delegation->cred)
2774                 cred = get_cred(delegation->cred);
2775         rcu_read_unlock();
2776         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2777         trace_nfs4_test_delegation_stateid(state, NULL, status);
2778         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2779                 nfs_finish_clear_delegation_stateid(state, &stateid);
2780
2781         if (delegation->cred)
2782                 put_cred(cred);
2783 }
2784
2785 /**
2786  * nfs41_check_expired_locks - possibly free a lock stateid
2787  *
2788  * @state: NFSv4 state for an inode
2789  *
2790  * Returns NFS_OK if recovery for this stateid is now finished.
2791  * Otherwise a negative NFS4ERR value is returned.
2792  */
2793 static int nfs41_check_expired_locks(struct nfs4_state *state)
2794 {
2795         int status, ret = NFS_OK;
2796         struct nfs4_lock_state *lsp, *prev = NULL;
2797         struct nfs_server *server = NFS_SERVER(state->inode);
2798
2799         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2800                 goto out;
2801
2802         spin_lock(&state->state_lock);
2803         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2804                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2805                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2806
2807                         refcount_inc(&lsp->ls_count);
2808                         spin_unlock(&state->state_lock);
2809
2810                         nfs4_put_lock_state(prev);
2811                         prev = lsp;
2812
2813                         status = nfs41_test_and_free_expired_stateid(server,
2814                                         &lsp->ls_stateid,
2815                                         cred);
2816                         trace_nfs4_test_lock_stateid(state, lsp, status);
2817                         if (status == -NFS4ERR_EXPIRED ||
2818                             status == -NFS4ERR_BAD_STATEID) {
2819                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2820                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2821                                 if (!recover_lost_locks)
2822                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2823                         } else if (status != NFS_OK) {
2824                                 ret = status;
2825                                 nfs4_put_lock_state(prev);
2826                                 goto out;
2827                         }
2828                         spin_lock(&state->state_lock);
2829                 }
2830         }
2831         spin_unlock(&state->state_lock);
2832         nfs4_put_lock_state(prev);
2833 out:
2834         return ret;
2835 }
2836
2837 /**
2838  * nfs41_check_open_stateid - possibly free an open stateid
2839  *
2840  * @state: NFSv4 state for an inode
2841  *
2842  * Returns NFS_OK if recovery for this stateid is now finished.
2843  * Otherwise a negative NFS4ERR value is returned.
2844  */
2845 static int nfs41_check_open_stateid(struct nfs4_state *state)
2846 {
2847         struct nfs_server *server = NFS_SERVER(state->inode);
2848         nfs4_stateid *stateid = &state->open_stateid;
2849         const struct cred *cred = state->owner->so_cred;
2850         int status;
2851
2852         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) {
2853                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)  {
2854                         if (nfs4_have_delegation(state->inode, state->state))
2855                                 return NFS_OK;
2856                         return -NFS4ERR_OPENMODE;
2857                 }
2858                 return -NFS4ERR_BAD_STATEID;
2859         }
2860         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2861         trace_nfs4_test_open_stateid(state, NULL, status);
2862         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2863                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2864                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2865                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2866                 clear_bit(NFS_OPEN_STATE, &state->flags);
2867                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2868                 return status;
2869         }
2870         if (nfs_open_stateid_recover_openmode(state))
2871                 return -NFS4ERR_OPENMODE;
2872         return NFS_OK;
2873 }
2874
2875 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2876 {
2877         int status;
2878
2879         nfs41_check_delegation_stateid(state);
2880         status = nfs41_check_expired_locks(state);
2881         if (status != NFS_OK)
2882                 return status;
2883         status = nfs41_check_open_stateid(state);
2884         if (status != NFS_OK)
2885                 status = nfs4_open_expired(sp, state);
2886         return status;
2887 }
2888 #endif
2889
2890 /*
2891  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2892  * fields corresponding to attributes that were used to store the verifier.
2893  * Make sure we clobber those fields in the later setattr call
2894  */
2895 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2896                                 struct iattr *sattr, struct nfs4_label **label)
2897 {
2898         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
2899         __u32 attrset[3];
2900         unsigned ret;
2901         unsigned i;
2902
2903         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
2904                 attrset[i] = opendata->o_res.attrset[i];
2905                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
2906                         attrset[i] &= ~bitmask[i];
2907         }
2908
2909         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
2910                 sattr->ia_valid : 0;
2911
2912         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
2913                 if (sattr->ia_valid & ATTR_ATIME_SET)
2914                         ret |= ATTR_ATIME_SET;
2915                 else
2916                         ret |= ATTR_ATIME;
2917         }
2918
2919         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
2920                 if (sattr->ia_valid & ATTR_MTIME_SET)
2921                         ret |= ATTR_MTIME_SET;
2922                 else
2923                         ret |= ATTR_MTIME;
2924         }
2925
2926         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
2927                 *label = NULL;
2928         return ret;
2929 }
2930
2931 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2932                 int flags, struct nfs_open_context *ctx)
2933 {
2934         struct nfs4_state_owner *sp = opendata->owner;
2935         struct nfs_server *server = sp->so_server;
2936         struct dentry *dentry;
2937         struct nfs4_state *state;
2938         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
2939         unsigned int seq;
2940         int ret;
2941
2942         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2943
2944         ret = _nfs4_proc_open(opendata, ctx);
2945         if (ret != 0)
2946                 goto out;
2947
2948         state = _nfs4_opendata_to_nfs4_state(opendata);
2949         ret = PTR_ERR(state);
2950         if (IS_ERR(state))
2951                 goto out;
2952         ctx->state = state;
2953         if (server->caps & NFS_CAP_POSIX_LOCK)
2954                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2955         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
2956                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
2957
2958         dentry = opendata->dentry;
2959         if (d_really_is_negative(dentry)) {
2960                 struct dentry *alias;
2961                 d_drop(dentry);
2962                 alias = d_exact_alias(dentry, state->inode);
2963                 if (!alias)
2964                         alias = d_splice_alias(igrab(state->inode), dentry);
2965                 /* d_splice_alias() can't fail here - it's a non-directory */
2966                 if (alias) {
2967                         dput(ctx->dentry);
2968                         ctx->dentry = dentry = alias;
2969                 }
2970                 nfs_set_verifier(dentry,
2971                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2972         }
2973
2974         /* Parse layoutget results before we check for access */
2975         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
2976
2977         ret = nfs4_opendata_access(sp->so_cred, opendata, state,
2978                         acc_mode, flags);
2979         if (ret != 0)
2980                 goto out;
2981
2982         if (d_inode(dentry) == state->inode) {
2983                 nfs_inode_attach_open_context(ctx);
2984                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2985                         nfs4_schedule_stateid_recovery(server, state);
2986         }
2987
2988 out:
2989         if (!opendata->cancelled)
2990                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
2991         return ret;
2992 }
2993
2994 /*
2995  * Returns a referenced nfs4_state
2996  */
2997 static int _nfs4_do_open(struct inode *dir,
2998                         struct nfs_open_context *ctx,
2999                         int flags,
3000                         const struct nfs4_open_createattrs *c,
3001                         int *opened)
3002 {
3003         struct nfs4_state_owner  *sp;
3004         struct nfs4_state     *state = NULL;
3005         struct nfs_server       *server = NFS_SERVER(dir);
3006         struct nfs4_opendata *opendata;
3007         struct dentry *dentry = ctx->dentry;
3008         const struct cred *cred = ctx->cred;
3009         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3010         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3011         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3012         struct iattr *sattr = c->sattr;
3013         struct nfs4_label *label = c->label;
3014         struct nfs4_label *olabel = NULL;
3015         int status;
3016
3017         /* Protect against reboot recovery conflicts */
3018         status = -ENOMEM;
3019         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3020         if (sp == NULL) {
3021                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3022                 goto out_err;
3023         }
3024         status = nfs4_client_recover_expired_lease(server->nfs_client);
3025         if (status != 0)
3026                 goto err_put_state_owner;
3027         if (d_really_is_positive(dentry))
3028                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3029         status = -ENOMEM;
3030         if (d_really_is_positive(dentry))
3031                 claim = NFS4_OPEN_CLAIM_FH;
3032         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3033                         c, claim, GFP_KERNEL);
3034         if (opendata == NULL)
3035                 goto err_put_state_owner;
3036
3037         if (label) {
3038                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
3039                 if (IS_ERR(olabel)) {
3040                         status = PTR_ERR(olabel);
3041                         goto err_opendata_put;
3042                 }
3043         }
3044
3045         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3046                 if (!opendata->f_attr.mdsthreshold) {
3047                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3048                         if (!opendata->f_attr.mdsthreshold)
3049                                 goto err_free_label;
3050                 }
3051                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3052         }
3053         if (d_really_is_positive(dentry))
3054                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3055
3056         status = _nfs4_open_and_get_state(opendata, flags, ctx);
3057         if (status != 0)
3058                 goto err_free_label;
3059         state = ctx->state;
3060
3061         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3062             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3063                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3064                 /*
3065                  * send create attributes which was not set by open
3066                  * with an extra setattr.
3067                  */
3068                 if (attrs || label) {
3069                         unsigned ia_old = sattr->ia_valid;
3070
3071                         sattr->ia_valid = attrs;
3072                         nfs_fattr_init(opendata->o_res.f_attr);
3073                         status = nfs4_do_setattr(state->inode, cred,
3074                                         opendata->o_res.f_attr, sattr,
3075                                         ctx, label, olabel);
3076                         if (status == 0) {
3077                                 nfs_setattr_update_inode(state->inode, sattr,
3078                                                 opendata->o_res.f_attr);
3079                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
3080                         }
3081                         sattr->ia_valid = ia_old;
3082                 }
3083         }
3084         if (opened && opendata->file_created)
3085                 *opened = 1;
3086
3087         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3088                 *ctx_th = opendata->f_attr.mdsthreshold;
3089                 opendata->f_attr.mdsthreshold = NULL;
3090         }
3091
3092         nfs4_label_free(olabel);
3093
3094         nfs4_opendata_put(opendata);
3095         nfs4_put_state_owner(sp);
3096         return 0;
3097 err_free_label:
3098         nfs4_label_free(olabel);
3099 err_opendata_put:
3100         nfs4_opendata_put(opendata);
3101 err_put_state_owner:
3102         nfs4_put_state_owner(sp);
3103 out_err:
3104         return status;
3105 }
3106
3107
3108 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3109                                         struct nfs_open_context *ctx,
3110                                         int flags,
3111                                         struct iattr *sattr,
3112                                         struct nfs4_label *label,
3113                                         int *opened)
3114 {
3115         struct nfs_server *server = NFS_SERVER(dir);
3116         struct nfs4_exception exception = {
3117                 .interruptible = true,
3118         };
3119         struct nfs4_state *res;
3120         struct nfs4_open_createattrs c = {
3121                 .label = label,
3122                 .sattr = sattr,
3123                 .verf = {
3124                         [0] = (__u32)jiffies,
3125                         [1] = (__u32)current->pid,
3126                 },
3127         };
3128         int status;
3129
3130         do {
3131                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3132                 res = ctx->state;
3133                 trace_nfs4_open_file(ctx, flags, status);
3134                 if (status == 0)
3135                         break;
3136                 /* NOTE: BAD_SEQID means the server and client disagree about the
3137                  * book-keeping w.r.t. state-changing operations
3138                  * (OPEN/CLOSE/LOCK/LOCKU...)
3139                  * It is actually a sign of a bug on the client or on the server.
3140                  *
3141                  * If we receive a BAD_SEQID error in the particular case of
3142                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3143                  * have unhashed the old state_owner for us, and that we can
3144                  * therefore safely retry using a new one. We should still warn
3145                  * the user though...
3146                  */
3147                 if (status == -NFS4ERR_BAD_SEQID) {
3148                         pr_warn_ratelimited("NFS: v4 server %s "
3149                                         " returned a bad sequence-id error!\n",
3150                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3151                         exception.retry = 1;
3152                         continue;
3153                 }
3154                 /*
3155                  * BAD_STATEID on OPEN means that the server cancelled our
3156                  * state before it received the OPEN_CONFIRM.
3157                  * Recover by retrying the request as per the discussion
3158                  * on Page 181 of RFC3530.
3159                  */
3160                 if (status == -NFS4ERR_BAD_STATEID) {
3161                         exception.retry = 1;
3162                         continue;
3163                 }
3164                 if (status == -EAGAIN) {
3165                         /* We must have found a delegation */
3166                         exception.retry = 1;
3167                         continue;
3168                 }
3169                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3170                         continue;
3171                 res = ERR_PTR(nfs4_handle_exception(server,
3172                                         status, &exception));
3173         } while (exception.retry);
3174         return res;
3175 }
3176
3177 static int _nfs4_do_setattr(struct inode *inode,
3178                             struct nfs_setattrargs *arg,
3179                             struct nfs_setattrres *res,
3180                             const struct cred *cred,
3181                             struct nfs_open_context *ctx)
3182 {
3183         struct nfs_server *server = NFS_SERVER(inode);
3184         struct rpc_message msg = {
3185                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3186                 .rpc_argp       = arg,
3187                 .rpc_resp       = res,
3188                 .rpc_cred       = cred,
3189         };
3190         const struct cred *delegation_cred = NULL;
3191         unsigned long timestamp = jiffies;
3192         bool truncate;
3193         int status;
3194
3195         nfs_fattr_init(res->fattr);
3196
3197         /* Servers should only apply open mode checks for file size changes */
3198         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3199         if (!truncate)
3200                 goto zero_stateid;
3201
3202         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3203                 /* Use that stateid */
3204         } else if (ctx != NULL) {
3205                 struct nfs_lock_context *l_ctx;
3206                 if (!nfs4_valid_open_stateid(ctx->state))
3207                         return -EBADF;
3208                 l_ctx = nfs_get_lock_context(ctx);
3209                 if (IS_ERR(l_ctx))
3210                         return PTR_ERR(l_ctx);
3211                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3212                                                 &arg->stateid, &delegation_cred);
3213                 nfs_put_lock_context(l_ctx);
3214                 if (status == -EIO)
3215                         return -EBADF;
3216         } else {
3217 zero_stateid:
3218                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3219         }
3220         if (delegation_cred)
3221                 msg.rpc_cred = delegation_cred;
3222
3223         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3224
3225         put_cred(delegation_cred);
3226         if (status == 0 && ctx != NULL)
3227                 renew_lease(server, timestamp);
3228         trace_nfs4_setattr(inode, &arg->stateid, status);
3229         return status;
3230 }
3231
3232 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3233                            struct nfs_fattr *fattr, struct iattr *sattr,
3234                            struct nfs_open_context *ctx, struct nfs4_label *ilabel,
3235                            struct nfs4_label *olabel)
3236 {
3237         struct nfs_server *server = NFS_SERVER(inode);
3238         __u32 bitmask[NFS4_BITMASK_SZ];
3239         struct nfs4_state *state = ctx ? ctx->state : NULL;
3240         struct nfs_setattrargs  arg = {
3241                 .fh             = NFS_FH(inode),
3242                 .iap            = sattr,
3243                 .server         = server,
3244                 .bitmask = bitmask,
3245                 .label          = ilabel,
3246         };
3247         struct nfs_setattrres  res = {
3248                 .fattr          = fattr,
3249                 .label          = olabel,
3250                 .server         = server,
3251         };
3252         struct nfs4_exception exception = {
3253                 .state = state,
3254                 .inode = inode,
3255                 .stateid = &arg.stateid,
3256         };
3257         int err;
3258
3259         do {
3260                 nfs4_bitmap_copy_adjust_setattr(bitmask,
3261                                 nfs4_bitmask(server, olabel),
3262                                 inode);
3263
3264                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3265                 switch (err) {
3266                 case -NFS4ERR_OPENMODE:
3267                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3268                                 pr_warn_once("NFSv4: server %s is incorrectly "
3269                                                 "applying open mode checks to "
3270                                                 "a SETATTR that is not "
3271                                                 "changing file size.\n",
3272                                                 server->nfs_client->cl_hostname);
3273                         }
3274                         if (state && !(state->state & FMODE_WRITE)) {
3275                                 err = -EBADF;
3276                                 if (sattr->ia_valid & ATTR_OPEN)
3277                                         err = -EACCES;
3278                                 goto out;
3279                         }
3280                 }
3281                 err = nfs4_handle_exception(server, err, &exception);
3282         } while (exception.retry);
3283 out:
3284         return err;
3285 }
3286
3287 static bool
3288 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3289 {
3290         if (inode == NULL || !nfs_have_layout(inode))
3291                 return false;
3292
3293         return pnfs_wait_on_layoutreturn(inode, task);
3294 }
3295
3296 struct nfs4_closedata {
3297         struct inode *inode;
3298         struct nfs4_state *state;
3299         struct nfs_closeargs arg;
3300         struct nfs_closeres res;
3301         struct {
3302                 struct nfs4_layoutreturn_args arg;
3303                 struct nfs4_layoutreturn_res res;
3304                 struct nfs4_xdr_opaque_data ld_private;
3305                 u32 roc_barrier;
3306                 bool roc;
3307         } lr;
3308         struct nfs_fattr fattr;
3309         unsigned long timestamp;
3310 };
3311
3312 static void nfs4_free_closedata(void *data)
3313 {
3314         struct nfs4_closedata *calldata = data;
3315         struct nfs4_state_owner *sp = calldata->state->owner;
3316         struct super_block *sb = calldata->state->inode->i_sb;
3317
3318         if (calldata->lr.roc)
3319                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3320                                 calldata->res.lr_ret);
3321         nfs4_put_open_state(calldata->state);
3322         nfs_free_seqid(calldata->arg.seqid);
3323         nfs4_put_state_owner(sp);
3324         nfs_sb_deactive(sb);
3325         kfree(calldata);
3326 }
3327
3328 static void nfs4_close_done(struct rpc_task *task, void *data)
3329 {
3330         struct nfs4_closedata *calldata = data;
3331         struct nfs4_state *state = calldata->state;
3332         struct nfs_server *server = NFS_SERVER(calldata->inode);
3333         nfs4_stateid *res_stateid = NULL;
3334         struct nfs4_exception exception = {
3335                 .state = state,
3336                 .inode = calldata->inode,
3337                 .stateid = &calldata->arg.stateid,
3338         };
3339
3340         dprintk("%s: begin!\n", __func__);
3341         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3342                 return;
3343         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3344
3345         /* Handle Layoutreturn errors */
3346         if (calldata->arg.lr_args && task->tk_status != 0) {
3347                 switch (calldata->res.lr_ret) {
3348                 default:
3349                         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3350                         break;
3351                 case 0:
3352                         calldata->arg.lr_args = NULL;
3353                         calldata->res.lr_res = NULL;
3354                         break;
3355                 case -NFS4ERR_OLD_STATEID:
3356                         if (nfs4_layoutreturn_refresh_stateid(&calldata->arg.lr_args->stateid,
3357                                                 &calldata->arg.lr_args->range,
3358                                                 calldata->inode))
3359                                 goto lr_restart;
3360                         /* Fallthrough */
3361                 case -NFS4ERR_ADMIN_REVOKED:
3362                 case -NFS4ERR_DELEG_REVOKED:
3363                 case -NFS4ERR_EXPIRED:
3364                 case -NFS4ERR_BAD_STATEID:
3365                 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
3366                 case -NFS4ERR_WRONG_CRED:
3367                         calldata->arg.lr_args = NULL;
3368                         calldata->res.lr_res = NULL;
3369                         goto lr_restart;
3370                 }
3371         }
3372
3373         /* hmm. we are done with the inode, and in the process of freeing
3374          * the state_owner. we keep this around to process errors
3375          */
3376         switch (task->tk_status) {
3377                 case 0:
3378                         res_stateid = &calldata->res.stateid;
3379                         renew_lease(server, calldata->timestamp);
3380                         break;
3381                 case -NFS4ERR_ACCESS:
3382                         if (calldata->arg.bitmask != NULL) {
3383                                 calldata->arg.bitmask = NULL;
3384                                 calldata->res.fattr = NULL;
3385                                 goto out_restart;
3386
3387                         }
3388                         break;
3389                 case -NFS4ERR_OLD_STATEID:
3390                         /* Did we race with OPEN? */
3391                         if (nfs4_refresh_open_stateid(&calldata->arg.stateid,
3392                                                 state))
3393                                 goto out_restart;
3394                         goto out_release;
3395                 case -NFS4ERR_ADMIN_REVOKED:
3396                 case -NFS4ERR_STALE_STATEID:
3397                 case -NFS4ERR_EXPIRED:
3398                         nfs4_free_revoked_stateid(server,
3399                                         &calldata->arg.stateid,
3400                                         task->tk_msg.rpc_cred);
3401                         /* Fallthrough */
3402                 case -NFS4ERR_BAD_STATEID:
3403                         break;
3404                 default:
3405                         task->tk_status = nfs4_async_handle_exception(task,
3406                                         server, task->tk_status, &exception);
3407                         if (exception.retry)
3408                                 goto out_restart;
3409         }
3410         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3411                         res_stateid, calldata->arg.fmode);
3412 out_release:
3413         task->tk_status = 0;
3414         nfs_release_seqid(calldata->arg.seqid);
3415         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3416         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
3417         return;
3418 lr_restart:
3419         calldata->res.lr_ret = 0;
3420 out_restart:
3421         task->tk_status = 0;
3422         rpc_restart_call_prepare(task);
3423         goto out_release;
3424 }
3425
3426 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3427 {
3428         struct nfs4_closedata *calldata = data;
3429         struct nfs4_state *state = calldata->state;
3430         struct inode *inode = calldata->inode;
3431         struct pnfs_layout_hdr *lo;
3432         bool is_rdonly, is_wronly, is_rdwr;
3433         int call_close = 0;
3434
3435         dprintk("%s: begin!\n", __func__);
3436         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3437                 goto out_wait;
3438
3439         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3440         spin_lock(&state->owner->so_lock);
3441         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3442         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3443         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3444         /* Calculate the change in open mode */
3445         calldata->arg.fmode = 0;
3446         if (state->n_rdwr == 0) {
3447                 if (state->n_rdonly == 0)
3448                         call_close |= is_rdonly;
3449                 else if (is_rdonly)
3450                         calldata->arg.fmode |= FMODE_READ;
3451                 if (state->n_wronly == 0)
3452                         call_close |= is_wronly;
3453                 else if (is_wronly)
3454                         calldata->arg.fmode |= FMODE_WRITE;
3455                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3456                         call_close |= is_rdwr;
3457         } else if (is_rdwr)
3458                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3459
3460         if (!nfs4_valid_open_stateid(state) ||
3461             !nfs4_refresh_open_stateid(&calldata->arg.stateid, state))
3462                 call_close = 0;
3463         spin_unlock(&state->owner->so_lock);
3464
3465         if (!call_close) {
3466                 /* Note: exit _without_ calling nfs4_close_done */
3467                 goto out_no_action;
3468         }
3469
3470         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3471                 nfs_release_seqid(calldata->arg.seqid);
3472                 goto out_wait;
3473         }
3474
3475         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3476         if (lo && !pnfs_layout_is_valid(lo)) {
3477                 calldata->arg.lr_args = NULL;
3478                 calldata->res.lr_res = NULL;
3479         }
3480
3481         if (calldata->arg.fmode == 0)
3482                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3483
3484         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3485                 /* Close-to-open cache consistency revalidation */
3486                 if (!nfs4_have_delegation(inode, FMODE_READ))
3487                         calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3488                 else
3489                         calldata->arg.bitmask = NULL;
3490         }
3491
3492         calldata->arg.share_access =
3493                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3494                                 calldata->arg.fmode, 0);
3495
3496         if (calldata->res.fattr == NULL)
3497                 calldata->arg.bitmask = NULL;
3498         else if (calldata->arg.bitmask == NULL)
3499                 calldata->res.fattr = NULL;
3500         calldata->timestamp = jiffies;
3501         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3502                                 &calldata->arg.seq_args,
3503                                 &calldata->res.seq_res,
3504                                 task) != 0)
3505                 nfs_release_seqid(calldata->arg.seqid);
3506         dprintk("%s: done!\n", __func__);
3507         return;
3508 out_no_action:
3509         task->tk_action = NULL;
3510 out_wait:
3511         nfs4_sequence_done(task, &calldata->res.seq_res);
3512 }
3513
3514 static const struct rpc_call_ops nfs4_close_ops = {
3515         .rpc_call_prepare = nfs4_close_prepare,
3516         .rpc_call_done = nfs4_close_done,
3517         .rpc_release = nfs4_free_closedata,
3518 };
3519
3520 /*
3521  * It is possible for data to be read/written from a mem-mapped file
3522  * after the sys_close call (which hits the vfs layer as a flush).
3523  * This means that we can't safely call nfsv4 close on a file until
3524  * the inode is cleared. This in turn means that we are not good
3525  * NFSv4 citizens - we do not indicate to the server to update the file's
3526  * share state even when we are done with one of the three share
3527  * stateid's in the inode.
3528  *
3529  * NOTE: Caller must be holding the sp->so_owner semaphore!
3530  */
3531 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3532 {
3533         struct nfs_server *server = NFS_SERVER(state->inode);
3534         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3535         struct nfs4_closedata *calldata;
3536         struct nfs4_state_owner *sp = state->owner;
3537         struct rpc_task *task;
3538         struct rpc_message msg = {
3539                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3540                 .rpc_cred = state->owner->so_cred,
3541         };
3542         struct rpc_task_setup task_setup_data = {
3543                 .rpc_client = server->client,
3544                 .rpc_message = &msg,
3545                 .callback_ops = &nfs4_close_ops,
3546                 .workqueue = nfsiod_workqueue,
3547                 .flags = RPC_TASK_ASYNC,
3548         };
3549         int status = -ENOMEM;
3550
3551         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3552                 &task_setup_data.rpc_client, &msg);
3553
3554         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3555         if (calldata == NULL)
3556                 goto out;
3557         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3558         calldata->inode = state->inode;
3559         calldata->state = state;
3560         calldata->arg.fh = NFS_FH(state->inode);
3561         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3562                 goto out_free_calldata;
3563         /* Serialization for the sequence id */
3564         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3565         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3566         if (IS_ERR(calldata->arg.seqid))
3567                 goto out_free_calldata;
3568         nfs_fattr_init(&calldata->fattr);
3569         calldata->arg.fmode = 0;
3570         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3571         calldata->res.fattr = &calldata->fattr;
3572         calldata->res.seqid = calldata->arg.seqid;
3573         calldata->res.server = server;
3574         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3575         calldata->lr.roc = pnfs_roc(state->inode,
3576                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3577         if (calldata->lr.roc) {
3578                 calldata->arg.lr_args = &calldata->lr.arg;
3579                 calldata->res.lr_res = &calldata->lr.res;
3580         }
3581         nfs_sb_active(calldata->inode->i_sb);
3582
3583         msg.rpc_argp = &calldata->arg;
3584         msg.rpc_resp = &calldata->res;
3585         task_setup_data.callback_data = calldata;
3586         task = rpc_run_task(&task_setup_data);
3587         if (IS_ERR(task))
3588                 return PTR_ERR(task);
3589         status = 0;
3590         if (wait)
3591                 status = rpc_wait_for_completion_task(task);
3592         rpc_put_task(task);
3593         return status;
3594 out_free_calldata:
3595         kfree(calldata);
3596 out:
3597         nfs4_put_open_state(state);
3598         nfs4_put_state_owner(sp);
3599         return status;
3600 }
3601
3602 static struct inode *
3603 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3604                 int open_flags, struct iattr *attr, int *opened)
3605 {
3606         struct nfs4_state *state;
3607         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3608
3609         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3610
3611         /* Protect against concurrent sillydeletes */
3612         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3613
3614         nfs4_label_release_security(label);
3615
3616         if (IS_ERR(state))
3617                 return ERR_CAST(state);
3618         return state->inode;
3619 }
3620
3621 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3622 {
3623         if (ctx->state == NULL)
3624                 return;
3625         if (is_sync)
3626                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3627         else
3628                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3629 }
3630
3631 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3632 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3633 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_MODE_UMASK - 1UL)
3634
3635 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3636 {
3637         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3638         struct nfs4_server_caps_arg args = {
3639                 .fhandle = fhandle,
3640                 .bitmask = bitmask,
3641         };
3642         struct nfs4_server_caps_res res = {};
3643         struct rpc_message msg = {
3644                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3645                 .rpc_argp = &args,
3646                 .rpc_resp = &res,
3647         };
3648         int status;
3649         int i;
3650
3651         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3652                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3653                      FATTR4_WORD0_LINK_SUPPORT |
3654                      FATTR4_WORD0_SYMLINK_SUPPORT |
3655                      FATTR4_WORD0_ACLSUPPORT;
3656         if (minorversion)
3657                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3658
3659         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3660         if (status == 0) {
3661                 /* Sanity check the server answers */
3662                 switch (minorversion) {
3663                 case 0:
3664                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3665                         res.attr_bitmask[2] = 0;
3666                         break;
3667                 case 1:
3668                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3669                         break;
3670                 case 2:
3671                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3672                 }
3673                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3674                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3675                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3676                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3677                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3678                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3679                                 NFS_CAP_SECURITY_LABEL);
3680                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3681                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3682                         server->caps |= NFS_CAP_ACLS;
3683                 if (res.has_links != 0)
3684                         server->caps |= NFS_CAP_HARDLINKS;
3685                 if (res.has_symlinks != 0)
3686                         server->caps |= NFS_CAP_SYMLINKS;
3687                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3688                         server->caps |= NFS_CAP_FILEID;
3689                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3690                         server->caps |= NFS_CAP_MODE;
3691                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3692                         server->caps |= NFS_CAP_NLINK;
3693                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3694                         server->caps |= NFS_CAP_OWNER;
3695                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3696                         server->caps |= NFS_CAP_OWNER_GROUP;
3697                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3698                         server->caps |= NFS_CAP_ATIME;
3699                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3700                         server->caps |= NFS_CAP_CTIME;
3701                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3702                         server->caps |= NFS_CAP_MTIME;
3703 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3704                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3705                         server->caps |= NFS_CAP_SECURITY_LABEL;
3706 #endif
3707                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3708                                 sizeof(server->attr_bitmask));
3709                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3710
3711                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3712                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3713                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3714                 server->cache_consistency_bitmask[2] = 0;
3715
3716                 /* Avoid a regression due to buggy server */
3717                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3718                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3719                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3720                         sizeof(server->exclcreat_bitmask));
3721
3722                 server->acl_bitmask = res.acl_bitmask;
3723                 server->fh_expire_type = res.fh_expire_type;
3724         }
3725
3726         return status;
3727 }
3728
3729 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3730 {
3731         struct nfs4_exception exception = {
3732                 .interruptible = true,
3733         };
3734         int err;
3735         do {
3736                 err = nfs4_handle_exception(server,
3737                                 _nfs4_server_capabilities(server, fhandle),
3738                                 &exception);
3739         } while (exception.retry);
3740         return err;
3741 }
3742
3743 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3744                 struct nfs_fsinfo *info)
3745 {
3746         u32 bitmask[3];
3747         struct nfs4_lookup_root_arg args = {
3748                 .bitmask = bitmask,
3749         };
3750         struct nfs4_lookup_res res = {
3751                 .server = server,
3752                 .fattr = info->fattr,
3753                 .fh = fhandle,
3754         };
3755         struct rpc_message msg = {
3756                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3757                 .rpc_argp = &args,
3758                 .rpc_resp = &res,
3759         };
3760
3761         bitmask[0] = nfs4_fattr_bitmap[0];
3762         bitmask[1] = nfs4_fattr_bitmap[1];
3763         /*
3764          * Process the label in the upcoming getfattr
3765          */
3766         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3767
3768         nfs_fattr_init(info->fattr);
3769         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3770 }
3771
3772 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3773                 struct nfs_fsinfo *info)
3774 {
3775         struct nfs4_exception exception = {
3776                 .interruptible = true,
3777         };
3778         int err;
3779         do {
3780                 err = _nfs4_lookup_root(server, fhandle, info);
3781                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3782                 switch (err) {
3783                 case 0:
3784                 case -NFS4ERR_WRONGSEC:
3785                         goto out;
3786                 default:
3787                         err = nfs4_handle_exception(server, err, &exception);
3788                 }
3789         } while (exception.retry);
3790 out:
3791         return err;
3792 }
3793
3794 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3795                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3796 {
3797         struct rpc_auth_create_args auth_args = {
3798                 .pseudoflavor = flavor,
3799         };
3800         struct rpc_auth *auth;
3801
3802         auth = rpcauth_create(&auth_args, server->client);
3803         if (IS_ERR(auth))
3804                 return -EACCES;
3805         return nfs4_lookup_root(server, fhandle, info);
3806 }
3807
3808 /*
3809  * Retry pseudoroot lookup with various security flavors.  We do this when:
3810  *
3811  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3812  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3813  *
3814  * Returns zero on success, or a negative NFS4ERR value, or a
3815  * negative errno value.
3816  */
3817 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3818                               struct nfs_fsinfo *info)
3819 {
3820         /* Per 3530bis 15.33.5 */
3821         static const rpc_authflavor_t flav_array[] = {
3822                 RPC_AUTH_GSS_KRB5P,
3823                 RPC_AUTH_GSS_KRB5I,
3824                 RPC_AUTH_GSS_KRB5,
3825                 RPC_AUTH_UNIX,                  /* courtesy */
3826                 RPC_AUTH_NULL,
3827         };
3828         int status = -EPERM;
3829         size_t i;
3830
3831         if (server->auth_info.flavor_len > 0) {
3832                 /* try each flavor specified by user */
3833                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3834                         status = nfs4_lookup_root_sec(server, fhandle, info,
3835                                                 server->auth_info.flavors[i]);
3836                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3837                                 continue;
3838                         break;
3839                 }
3840         } else {
3841                 /* no flavors specified by user, try default list */
3842                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3843                         status = nfs4_lookup_root_sec(server, fhandle, info,
3844                                                       flav_array[i]);
3845                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3846                                 continue;
3847                         break;
3848                 }
3849         }
3850
3851         /*
3852          * -EACCES could mean that the user doesn't have correct permissions
3853          * to access the mount.  It could also mean that we tried to mount
3854          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3855          * existing mount programs don't handle -EACCES very well so it should
3856          * be mapped to -EPERM instead.
3857          */
3858         if (status == -EACCES)
3859                 status = -EPERM;
3860         return status;
3861 }
3862
3863 /**
3864  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3865  * @server: initialized nfs_server handle
3866  * @fhandle: we fill in the pseudo-fs root file handle
3867  * @info: we fill in an FSINFO struct
3868  * @auth_probe: probe the auth flavours
3869  *
3870  * Returns zero on success, or a negative errno.
3871  */
3872 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3873                          struct nfs_fsinfo *info,
3874                          bool auth_probe)
3875 {
3876         int status = 0;
3877
3878         if (!auth_probe)
3879                 status = nfs4_lookup_root(server, fhandle, info);
3880
3881         if (auth_probe || status == NFS4ERR_WRONGSEC)
3882                 status = server->nfs_client->cl_mvops->find_root_sec(server,
3883                                 fhandle, info);
3884
3885         if (status == 0)
3886                 status = nfs4_server_capabilities(server, fhandle);
3887         if (status == 0)
3888                 status = nfs4_do_fsinfo(server, fhandle, info);
3889
3890         return nfs4_map_errors(status);
3891 }
3892
3893 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3894                               struct nfs_fsinfo *info)
3895 {
3896         int error;
3897         struct nfs_fattr *fattr = info->fattr;
3898         struct nfs4_label *label = NULL;
3899
3900         error = nfs4_server_capabilities(server, mntfh);
3901         if (error < 0) {
3902                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3903                 return error;
3904         }
3905
3906         label = nfs4_label_alloc(server, GFP_KERNEL);
3907         if (IS_ERR(label))
3908                 return PTR_ERR(label);
3909
3910         error = nfs4_proc_getattr(server, mntfh, fattr, label, NULL);
3911         if (error < 0) {
3912                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3913                 goto err_free_label;
3914         }
3915
3916         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3917             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3918                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3919
3920 err_free_label:
3921         nfs4_label_free(label);
3922
3923         return error;
3924 }
3925
3926 /*
3927  * Get locations and (maybe) other attributes of a referral.
3928  * Note that we'll actually follow the referral later when
3929  * we detect fsid mismatch in inode revalidation
3930  */
3931 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3932                              const struct qstr *name, struct nfs_fattr *fattr,
3933                              struct nfs_fh *fhandle)
3934 {
3935         int status = -ENOMEM;
3936         struct page *page = NULL;
3937         struct nfs4_fs_locations *locations = NULL;
3938
3939         page = alloc_page(GFP_KERNEL);
3940         if (page == NULL)
3941                 goto out;
3942         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3943         if (locations == NULL)
3944                 goto out;
3945
3946         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3947         if (status != 0)
3948                 goto out;
3949
3950         /*
3951          * If the fsid didn't change, this is a migration event, not a
3952          * referral.  Cause us to drop into the exception handler, which
3953          * will kick off migration recovery.
3954          */
3955         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3956                 dprintk("%s: server did not return a different fsid for"
3957                         " a referral at %s\n", __func__, name->name);
3958                 status = -NFS4ERR_MOVED;
3959                 goto out;
3960         }
3961         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3962         nfs_fixup_referral_attributes(&locations->fattr);
3963
3964         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3965         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3966         memset(fhandle, 0, sizeof(struct nfs_fh));
3967 out:
3968         if (page)
3969                 __free_page(page);
3970         kfree(locations);
3971         return status;
3972 }
3973
3974 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3975                                 struct nfs_fattr *fattr, struct nfs4_label *label,
3976                                 struct inode *inode)
3977 {
3978         __u32 bitmask[NFS4_BITMASK_SZ];
3979         struct nfs4_getattr_arg args = {
3980                 .fh = fhandle,
3981                 .bitmask = bitmask,
3982         };
3983         struct nfs4_getattr_res res = {
3984                 .fattr = fattr,
3985                 .label = label,
3986                 .server = server,
3987         };
3988         struct rpc_message msg = {
3989                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3990                 .rpc_argp = &args,
3991                 .rpc_resp = &res,
3992         };
3993
3994         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode);
3995
3996         nfs_fattr_init(fattr);
3997         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3998 }
3999
4000 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4001                                 struct nfs_fattr *fattr, struct nfs4_label *label,
4002                                 struct inode *inode)
4003 {
4004         struct nfs4_exception exception = {
4005                 .interruptible = true,
4006         };
4007         int err;
4008         do {
4009                 err = _nfs4_proc_getattr(server, fhandle, fattr, label, inode);
4010                 trace_nfs4_getattr(server, fhandle, fattr, err);
4011                 err = nfs4_handle_exception(server, err,
4012                                 &exception);
4013         } while (exception.retry);
4014         return err;
4015 }
4016
4017 /*
4018  * The file is not closed if it is opened due to the a request to change
4019  * the size of the file. The open call will not be needed once the
4020  * VFS layer lookup-intents are implemented.
4021  *
4022  * Close is called when the inode is destroyed.
4023  * If we haven't opened the file for O_WRONLY, we
4024  * need to in the size_change case to obtain a stateid.
4025  *
4026  * Got race?
4027  * Because OPEN is always done by name in nfsv4, it is
4028  * possible that we opened a different file by the same
4029  * name.  We can recognize this race condition, but we
4030  * can't do anything about it besides returning an error.
4031  *
4032  * This will be fixed with VFS changes (lookup-intent).
4033  */
4034 static int
4035 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4036                   struct iattr *sattr)
4037 {
4038         struct inode *inode = d_inode(dentry);
4039         const struct cred *cred = NULL;
4040         struct nfs_open_context *ctx = NULL;
4041         struct nfs4_label *label = NULL;
4042         int status;
4043
4044         if (pnfs_ld_layoutret_on_setattr(inode) &&
4045             sattr->ia_valid & ATTR_SIZE &&
4046             sattr->ia_size < i_size_read(inode))
4047                 pnfs_commit_and_return_layout(inode);
4048
4049         nfs_fattr_init(fattr);
4050
4051         /* Deal with open(O_TRUNC) */
4052         if (sattr->ia_valid & ATTR_OPEN)
4053                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4054
4055         /* Optimization: if the end result is no change, don't RPC */
4056         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4057                 return 0;
4058
4059         /* Search for an existing open(O_WRITE) file */
4060         if (sattr->ia_valid & ATTR_FILE) {
4061
4062                 ctx = nfs_file_open_context(sattr->ia_file);
4063                 if (ctx)
4064                         cred = ctx->cred;
4065         }
4066
4067         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4068         if (IS_ERR(label))
4069                 return PTR_ERR(label);
4070
4071         /* Return any delegations if we're going to change ACLs */
4072         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4073                 nfs4_inode_make_writeable(inode);
4074
4075         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label);
4076         if (status == 0) {
4077                 nfs_setattr_update_inode(inode, sattr, fattr);
4078                 nfs_setsecurity(inode, fattr, label);
4079         }
4080         nfs4_label_free(label);
4081         return status;
4082 }
4083
4084 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4085                 const struct qstr *name, struct nfs_fh *fhandle,
4086                 struct nfs_fattr *fattr, struct nfs4_label *label)
4087 {
4088         struct nfs_server *server = NFS_SERVER(dir);
4089         int                    status;
4090         struct nfs4_lookup_arg args = {
4091                 .bitmask = server->attr_bitmask,
4092                 .dir_fh = NFS_FH(dir),
4093                 .name = name,
4094         };
4095         struct nfs4_lookup_res res = {
4096                 .server = server,
4097                 .fattr = fattr,
4098                 .label = label,
4099                 .fh = fhandle,
4100         };
4101         struct rpc_message msg = {
4102                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4103                 .rpc_argp = &args,
4104                 .rpc_resp = &res,
4105         };
4106
4107         args.bitmask = nfs4_bitmask(server, label);
4108
4109         nfs_fattr_init(fattr);
4110
4111         dprintk("NFS call  lookup %s\n", name->name);
4112         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
4113         dprintk("NFS reply lookup: %d\n", status);
4114         return status;
4115 }
4116
4117 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4118 {
4119         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4120                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4121         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4122         fattr->nlink = 2;
4123 }
4124
4125 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4126                                    const struct qstr *name, struct nfs_fh *fhandle,
4127                                    struct nfs_fattr *fattr, struct nfs4_label *label)
4128 {
4129         struct nfs4_exception exception = {
4130                 .interruptible = true,
4131         };
4132         struct rpc_clnt *client = *clnt;
4133         int err;
4134         do {
4135                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
4136                 trace_nfs4_lookup(dir, name, err);
4137                 switch (err) {
4138                 case -NFS4ERR_BADNAME:
4139                         err = -ENOENT;
4140                         goto out;
4141                 case -NFS4ERR_MOVED:
4142                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4143                         if (err == -NFS4ERR_MOVED)
4144                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4145                         goto out;
4146                 case -NFS4ERR_WRONGSEC:
4147                         err = -EPERM;
4148                         if (client != *clnt)
4149                                 goto out;
4150                         client = nfs4_negotiate_security(client, dir, name);
4151                         if (IS_ERR(client))
4152                                 return PTR_ERR(client);
4153
4154                         exception.retry = 1;
4155                         break;
4156                 default:
4157                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4158                 }
4159         } while (exception.retry);
4160
4161 out:
4162         if (err == 0)
4163                 *clnt = client;
4164         else if (client != *clnt)
4165                 rpc_shutdown_client(client);
4166
4167         return err;
4168 }
4169
4170 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
4171                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4172                             struct nfs4_label *label)
4173 {
4174         int status;
4175         struct rpc_clnt *client = NFS_CLIENT(dir);
4176
4177         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
4178         if (client != NFS_CLIENT(dir)) {
4179                 rpc_shutdown_client(client);
4180                 nfs_fixup_secinfo_attributes(fattr);
4181         }
4182         return status;
4183 }
4184
4185 struct rpc_clnt *
4186 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name,
4187                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4188 {
4189         struct rpc_clnt *client = NFS_CLIENT(dir);
4190         int status;
4191
4192         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
4193         if (status < 0)
4194                 return ERR_PTR(status);
4195         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4196 }
4197
4198 static int _nfs4_proc_lookupp(struct inode *inode,
4199                 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4200                 struct nfs4_label *label)
4201 {
4202         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4203         struct nfs_server *server = NFS_SERVER(inode);
4204         int                    status;
4205         struct nfs4_lookupp_arg args = {
4206                 .bitmask = server->attr_bitmask,
4207                 .fh = NFS_FH(inode),
4208         };
4209         struct nfs4_lookupp_res res = {
4210                 .server = server,
4211                 .fattr = fattr,
4212                 .label = label,
4213                 .fh = fhandle,
4214         };
4215         struct rpc_message msg = {
4216                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4217                 .rpc_argp = &args,
4218                 .rpc_resp = &res,
4219         };
4220
4221         args.bitmask = nfs4_bitmask(server, label);
4222
4223         nfs_fattr_init(fattr);
4224
4225         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4226         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4227                                 &res.seq_res, 0);
4228         dprintk("NFS reply lookupp: %d\n", status);
4229         return status;
4230 }
4231
4232 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4233                              struct nfs_fattr *fattr, struct nfs4_label *label)
4234 {
4235         struct nfs4_exception exception = {
4236                 .interruptible = true,
4237         };
4238         int err;
4239         do {
4240                 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label);
4241                 trace_nfs4_lookupp(inode, err);
4242                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4243                                 &exception);
4244         } while (exception.retry);
4245         return err;
4246 }
4247
4248 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4249 {
4250         struct nfs_server *server = NFS_SERVER(inode);
4251         struct nfs4_accessargs args = {
4252                 .fh = NFS_FH(inode),
4253                 .access = entry->mask,
4254         };
4255         struct nfs4_accessres res = {
4256                 .server = server,
4257         };
4258         struct rpc_message msg = {
4259                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4260                 .rpc_argp = &args,
4261                 .rpc_resp = &res,
4262                 .rpc_cred = entry->cred,
4263         };
4264         int status = 0;
4265
4266         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4267                 res.fattr = nfs_alloc_fattr();
4268                 if (res.fattr == NULL)
4269                         return -ENOMEM;
4270                 args.bitmask = server->cache_consistency_bitmask;
4271         }
4272         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4273         if (!status) {
4274                 nfs_access_set_mask(entry, res.access);
4275                 if (res.fattr)
4276                         nfs_refresh_inode(inode, res.fattr);
4277         }
4278         nfs_free_fattr(res.fattr);
4279         return status;
4280 }
4281
4282 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4283 {
4284         struct nfs4_exception exception = {
4285                 .interruptible = true,
4286         };
4287         int err;
4288         do {
4289                 err = _nfs4_proc_access(inode, entry);
4290                 trace_nfs4_access(inode, err);
4291                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4292                                 &exception);
4293         } while (exception.retry);
4294         return err;
4295 }
4296
4297 /*
4298  * TODO: For the time being, we don't try to get any attributes
4299  * along with any of the zero-copy operations READ, READDIR,
4300  * READLINK, WRITE.
4301  *
4302  * In the case of the first three, we want to put the GETATTR
4303  * after the read-type operation -- this is because it is hard
4304  * to predict the length of a GETATTR response in v4, and thus
4305  * align the READ data correctly.  This means that the GETATTR
4306  * may end up partially falling into the page cache, and we should
4307  * shift it into the 'tail' of the xdr_buf before processing.
4308  * To do this efficiently, we need to know the total length
4309  * of data received, which doesn't seem to be available outside
4310  * of the RPC layer.
4311  *
4312  * In the case of WRITE, we also want to put the GETATTR after
4313  * the operation -- in this case because we want to make sure
4314  * we get the post-operation mtime and size.
4315  *
4316  * Both of these changes to the XDR layer would in fact be quite
4317  * minor, but I decided to leave them for a subsequent patch.
4318  */
4319 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4320                 unsigned int pgbase, unsigned int pglen)
4321 {
4322         struct nfs4_readlink args = {
4323                 .fh       = NFS_FH(inode),
4324                 .pgbase   = pgbase,
4325                 .pglen    = pglen,
4326                 .pages    = &page,
4327         };
4328         struct nfs4_readlink_res res;
4329         struct rpc_message msg = {
4330                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4331                 .rpc_argp = &args,
4332                 .rpc_resp = &res,
4333         };
4334
4335         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4336 }
4337
4338 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4339                 unsigned int pgbase, unsigned int pglen)
4340 {
4341         struct nfs4_exception exception = {
4342                 .interruptible = true,
4343         };
4344         int err;
4345         do {
4346                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4347                 trace_nfs4_readlink(inode, err);
4348                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4349                                 &exception);
4350         } while (exception.retry);
4351         return err;
4352 }
4353
4354 /*
4355  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4356  */
4357 static int
4358 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4359                  int flags)
4360 {
4361         struct nfs_server *server = NFS_SERVER(dir);
4362         struct nfs4_label l, *ilabel = NULL;
4363         struct nfs_open_context *ctx;
4364         struct nfs4_state *state;
4365         int status = 0;
4366
4367         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4368         if (IS_ERR(ctx))
4369                 return PTR_ERR(ctx);
4370
4371         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4372
4373         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4374                 sattr->ia_mode &= ~current_umask();
4375         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4376         if (IS_ERR(state)) {
4377                 status = PTR_ERR(state);
4378                 goto out;
4379         }
4380 out:
4381         nfs4_label_release_security(ilabel);
4382         put_nfs_open_context(ctx);
4383         return status;
4384 }
4385
4386 static int
4387 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4388 {
4389         struct nfs_server *server = NFS_SERVER(dir);
4390         struct nfs_removeargs args = {
4391                 .fh = NFS_FH(dir),
4392                 .name = *name,
4393         };
4394         struct nfs_removeres res = {
4395                 .server = server,
4396         };
4397         struct rpc_message msg = {
4398                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4399                 .rpc_argp = &args,
4400                 .rpc_resp = &res,
4401         };
4402         unsigned long timestamp = jiffies;
4403         int status;
4404
4405         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4406         if (status == 0) {
4407                 spin_lock(&dir->i_lock);
4408                 update_changeattr_locked(dir, &res.cinfo, timestamp, 0);
4409                 /* Removing a directory decrements nlink in the parent */
4410                 if (ftype == NF4DIR && dir->i_nlink > 2)
4411                         nfs4_dec_nlink_locked(dir);
4412                 spin_unlock(&dir->i_lock);
4413         }
4414         return status;
4415 }
4416
4417 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4418 {
4419         struct nfs4_exception exception = {
4420                 .interruptible = true,
4421         };
4422         struct inode *inode = d_inode(dentry);
4423         int err;
4424
4425         if (inode) {
4426                 if (inode->i_nlink == 1)
4427                         nfs4_inode_return_delegation(inode);
4428                 else
4429                         nfs4_inode_make_writeable(inode);
4430         }
4431         do {
4432                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4433                 trace_nfs4_remove(dir, &dentry->d_name, err);
4434                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4435                                 &exception);
4436         } while (exception.retry);
4437         return err;
4438 }
4439
4440 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4441 {
4442         struct nfs4_exception exception = {
4443                 .interruptible = true,
4444         };
4445         int err;
4446
4447         do {
4448                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4449                 trace_nfs4_remove(dir, name, err);
4450                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4451                                 &exception);
4452         } while (exception.retry);
4453         return err;
4454 }
4455
4456 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4457                 struct dentry *dentry,
4458                 struct inode *inode)
4459 {
4460         struct nfs_removeargs *args = msg->rpc_argp;
4461         struct nfs_removeres *res = msg->rpc_resp;
4462
4463         res->server = NFS_SB(dentry->d_sb);
4464         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4465         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4466
4467         nfs_fattr_init(res->dir_attr);
4468
4469         if (inode)
4470                 nfs4_inode_return_delegation(inode);
4471 }
4472
4473 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4474 {
4475         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4476                         &data->args.seq_args,
4477                         &data->res.seq_res,
4478                         task);
4479 }
4480
4481 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4482 {
4483         struct nfs_unlinkdata *data = task->tk_calldata;
4484         struct nfs_removeres *res = &data->res;
4485
4486         if (!nfs4_sequence_done(task, &res->seq_res))
4487                 return 0;
4488         if (nfs4_async_handle_error(task, res->server, NULL,
4489                                     &data->timeout) == -EAGAIN)
4490                 return 0;
4491         if (task->tk_status == 0)
4492                 update_changeattr(dir, &res->cinfo,
4493                                 res->dir_attr->time_start, 0);
4494         return 1;
4495 }
4496
4497 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4498                 struct dentry *old_dentry,
4499                 struct dentry *new_dentry)
4500 {
4501         struct nfs_renameargs *arg = msg->rpc_argp;
4502         struct nfs_renameres *res = msg->rpc_resp;
4503         struct inode *old_inode = d_inode(old_dentry);
4504         struct inode *new_inode = d_inode(new_dentry);
4505
4506         if (old_inode)
4507                 nfs4_inode_make_writeable(old_inode);
4508         if (new_inode)
4509                 nfs4_inode_return_delegation(new_inode);
4510         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4511         res->server = NFS_SB(old_dentry->d_sb);
4512         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4513 }
4514
4515 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4516 {
4517         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4518                         &data->args.seq_args,
4519                         &data->res.seq_res,
4520                         task);
4521 }
4522
4523 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4524                                  struct inode *new_dir)
4525 {
4526         struct nfs_renamedata *data = task->tk_calldata;
4527         struct nfs_renameres *res = &data->res;
4528
4529         if (!nfs4_sequence_done(task, &res->seq_res))
4530                 return 0;
4531         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4532                 return 0;
4533
4534         if (task->tk_status == 0) {
4535                 if (new_dir != old_dir) {
4536                         /* Note: If we moved a directory, nlink will change */
4537                         update_changeattr(old_dir, &res->old_cinfo,
4538                                         res->old_fattr->time_start,
4539                                         NFS_INO_INVALID_OTHER);
4540                         update_changeattr(new_dir, &res->new_cinfo,
4541                                         res->new_fattr->time_start,
4542                                         NFS_INO_INVALID_OTHER);
4543                 } else
4544                         update_changeattr(old_dir, &res->old_cinfo,
4545                                         res->old_fattr->time_start,
4546                                         0);
4547         }
4548         return 1;
4549 }
4550
4551 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4552 {
4553         struct nfs_server *server = NFS_SERVER(inode);
4554         __u32 bitmask[NFS4_BITMASK_SZ];
4555         struct nfs4_link_arg arg = {
4556                 .fh     = NFS_FH(inode),
4557                 .dir_fh = NFS_FH(dir),
4558                 .name   = name,
4559                 .bitmask = bitmask,
4560         };
4561         struct nfs4_link_res res = {
4562                 .server = server,
4563                 .label = NULL,
4564         };
4565         struct rpc_message msg = {
4566                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4567                 .rpc_argp = &arg,
4568                 .rpc_resp = &res,
4569         };
4570         int status = -ENOMEM;
4571
4572         res.fattr = nfs_alloc_fattr();
4573         if (res.fattr == NULL)
4574                 goto out;
4575
4576         res.label = nfs4_label_alloc(server, GFP_KERNEL);
4577         if (IS_ERR(res.label)) {
4578                 status = PTR_ERR(res.label);
4579                 goto out;
4580         }
4581
4582         nfs4_inode_make_writeable(inode);
4583         nfs4_bitmap_copy_adjust_setattr(bitmask, nfs4_bitmask(server, res.label), inode);
4584
4585         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4586         if (!status) {
4587                 update_changeattr(dir, &res.cinfo, res.fattr->time_start, 0);
4588                 status = nfs_post_op_update_inode(inode, res.fattr);
4589                 if (!status)
4590                         nfs_setsecurity(inode, res.fattr, res.label);
4591         }
4592
4593
4594         nfs4_label_free(res.label);
4595
4596 out:
4597         nfs_free_fattr(res.fattr);
4598         return status;
4599 }
4600
4601 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4602 {
4603         struct nfs4_exception exception = {
4604                 .interruptible = true,
4605         };
4606         int err;
4607         do {
4608                 err = nfs4_handle_exception(NFS_SERVER(inode),
4609                                 _nfs4_proc_link(inode, dir, name),
4610                                 &exception);
4611         } while (exception.retry);
4612         return err;
4613 }
4614
4615 struct nfs4_createdata {
4616         struct rpc_message msg;
4617         struct nfs4_create_arg arg;
4618         struct nfs4_create_res res;
4619         struct nfs_fh fh;
4620         struct nfs_fattr fattr;
4621         struct nfs4_label *label;
4622 };
4623
4624 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4625                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4626 {
4627         struct nfs4_createdata *data;
4628
4629         data = kzalloc(sizeof(*data), GFP_KERNEL);
4630         if (data != NULL) {
4631                 struct nfs_server *server = NFS_SERVER(dir);
4632
4633                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
4634                 if (IS_ERR(data->label))
4635                         goto out_free;
4636
4637                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4638                 data->msg.rpc_argp = &data->arg;
4639                 data->msg.rpc_resp = &data->res;
4640                 data->arg.dir_fh = NFS_FH(dir);
4641                 data->arg.server = server;
4642                 data->arg.name = name;
4643                 data->arg.attrs = sattr;
4644                 data->arg.ftype = ftype;
4645                 data->arg.bitmask = nfs4_bitmask(server, data->label);
4646                 data->arg.umask = current_umask();
4647                 data->res.server = server;
4648                 data->res.fh = &data->fh;
4649                 data->res.fattr = &data->fattr;
4650                 data->res.label = data->label;
4651                 nfs_fattr_init(data->res.fattr);
4652         }
4653         return data;
4654 out_free:
4655         kfree(data);
4656         return NULL;
4657 }
4658
4659 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4660 {
4661         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4662                                     &data->arg.seq_args, &data->res.seq_res, 1);
4663         if (status == 0) {
4664                 spin_lock(&dir->i_lock);
4665                 update_changeattr_locked(dir, &data->res.dir_cinfo,
4666                                 data->res.fattr->time_start, 0);
4667                 /* Creating a directory bumps nlink in the parent */
4668                 if (data->arg.ftype == NF4DIR)
4669                         nfs4_inc_nlink_locked(dir);
4670                 spin_unlock(&dir->i_lock);
4671                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4672         }
4673         return status;
4674 }
4675
4676 static void nfs4_free_createdata(struct nfs4_createdata *data)
4677 {
4678         nfs4_label_free(data->label);
4679         kfree(data);
4680 }
4681
4682 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4683                 struct page *page, unsigned int len, struct iattr *sattr,
4684                 struct nfs4_label *label)
4685 {
4686         struct nfs4_createdata *data;
4687         int status = -ENAMETOOLONG;
4688
4689         if (len > NFS4_MAXPATHLEN)
4690                 goto out;
4691
4692         status = -ENOMEM;
4693         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4694         if (data == NULL)
4695                 goto out;
4696
4697         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4698         data->arg.u.symlink.pages = &page;
4699         data->arg.u.symlink.len = len;
4700         data->arg.label = label;
4701
4702         status = nfs4_do_create(dir, dentry, data);
4703
4704         nfs4_free_createdata(data);
4705 out:
4706         return status;
4707 }
4708
4709 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4710                 struct page *page, unsigned int len, struct iattr *sattr)
4711 {
4712         struct nfs4_exception exception = {
4713                 .interruptible = true,
4714         };
4715         struct nfs4_label l, *label = NULL;
4716         int err;
4717
4718         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4719
4720         do {
4721                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4722                 trace_nfs4_symlink(dir, &dentry->d_name, err);
4723                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4724                                 &exception);
4725         } while (exception.retry);
4726
4727         nfs4_label_release_security(label);
4728         return err;
4729 }
4730
4731 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4732                 struct iattr *sattr, struct nfs4_label *label)
4733 {
4734         struct nfs4_createdata *data;
4735         int status = -ENOMEM;
4736
4737         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4738         if (data == NULL)
4739                 goto out;
4740
4741         data->arg.label = label;
4742         status = nfs4_do_create(dir, dentry, data);
4743
4744         nfs4_free_createdata(data);
4745 out:
4746         return status;
4747 }
4748
4749 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4750                 struct iattr *sattr)
4751 {
4752         struct nfs_server *server = NFS_SERVER(dir);
4753         struct nfs4_exception exception = {
4754                 .interruptible = true,
4755         };
4756         struct nfs4_label l, *label = NULL;
4757         int err;
4758
4759         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4760
4761         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4762                 sattr->ia_mode &= ~current_umask();
4763         do {
4764                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4765                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4766                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4767                                 &exception);
4768         } while (exception.retry);
4769         nfs4_label_release_security(label);
4770
4771         return err;
4772 }
4773
4774 static int _nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred,
4775                 u64 cookie, struct page **pages, unsigned int count, bool plus)
4776 {
4777         struct inode            *dir = d_inode(dentry);
4778         struct nfs4_readdir_arg args = {
4779                 .fh = NFS_FH(dir),
4780                 .pages = pages,
4781                 .pgbase = 0,
4782                 .count = count,
4783                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4784                 .plus = plus,
4785         };
4786         struct nfs4_readdir_res res;
4787         struct rpc_message msg = {
4788                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4789                 .rpc_argp = &args,
4790                 .rpc_resp = &res,
4791                 .rpc_cred = cred,
4792         };
4793         int                     status;
4794
4795         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4796                         dentry,
4797                         (unsigned long long)cookie);
4798         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4799         res.pgbase = args.pgbase;
4800         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4801         if (status >= 0) {
4802                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4803                 status += args.pgbase;
4804         }
4805
4806         nfs_invalidate_atime(dir);
4807
4808         dprintk("%s: returns %d\n", __func__, status);
4809         return status;
4810 }
4811
4812 static int nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred,
4813                 u64 cookie, struct page **pages, unsigned int count, bool plus)
4814 {
4815         struct nfs4_exception exception = {
4816                 .interruptible = true,
4817         };
4818         int err;
4819         do {
4820                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4821                                 pages, count, plus);
4822                 trace_nfs4_readdir(d_inode(dentry), err);
4823                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4824                                 &exception);
4825         } while (exception.retry);
4826         return err;
4827 }
4828
4829 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4830                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4831 {
4832         struct nfs4_createdata *data;
4833         int mode = sattr->ia_mode;
4834         int status = -ENOMEM;
4835
4836         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4837         if (data == NULL)
4838                 goto out;
4839
4840         if (S_ISFIFO(mode))
4841                 data->arg.ftype = NF4FIFO;
4842         else if (S_ISBLK(mode)) {
4843                 data->arg.ftype = NF4BLK;
4844                 data->arg.u.device.specdata1 = MAJOR(rdev);
4845                 data->arg.u.device.specdata2 = MINOR(rdev);
4846         }
4847         else if (S_ISCHR(mode)) {
4848                 data->arg.ftype = NF4CHR;
4849                 data->arg.u.device.specdata1 = MAJOR(rdev);
4850                 data->arg.u.device.specdata2 = MINOR(rdev);
4851         } else if (!S_ISSOCK(mode)) {
4852                 status = -EINVAL;
4853                 goto out_free;
4854         }
4855
4856         data->arg.label = label;
4857         status = nfs4_do_create(dir, dentry, data);
4858 out_free:
4859         nfs4_free_createdata(data);
4860 out:
4861         return status;
4862 }
4863
4864 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4865                 struct iattr *sattr, dev_t rdev)
4866 {
4867         struct nfs_server *server = NFS_SERVER(dir);
4868         struct nfs4_exception exception = {
4869                 .interruptible = true,
4870         };
4871         struct nfs4_label l, *label = NULL;
4872         int err;
4873
4874         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4875
4876         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4877                 sattr->ia_mode &= ~current_umask();
4878         do {
4879                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4880                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4881                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4882                                 &exception);
4883         } while (exception.retry);
4884
4885         nfs4_label_release_security(label);
4886
4887         return err;
4888 }
4889
4890 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4891                  struct nfs_fsstat *fsstat)
4892 {
4893         struct nfs4_statfs_arg args = {
4894                 .fh = fhandle,
4895                 .bitmask = server->attr_bitmask,
4896         };
4897         struct nfs4_statfs_res res = {
4898                 .fsstat = fsstat,
4899         };
4900         struct rpc_message msg = {
4901                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4902                 .rpc_argp = &args,
4903                 .rpc_resp = &res,
4904         };
4905
4906         nfs_fattr_init(fsstat->fattr);
4907         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4908 }
4909
4910 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4911 {
4912         struct nfs4_exception exception = {
4913                 .interruptible = true,
4914         };
4915         int err;
4916         do {
4917                 err = nfs4_handle_exception(server,
4918                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4919                                 &exception);
4920         } while (exception.retry);
4921         return err;
4922 }
4923
4924 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4925                 struct nfs_fsinfo *fsinfo)
4926 {
4927         struct nfs4_fsinfo_arg args = {
4928                 .fh = fhandle,
4929                 .bitmask = server->attr_bitmask,
4930         };
4931         struct nfs4_fsinfo_res res = {
4932                 .fsinfo = fsinfo,
4933         };
4934         struct rpc_message msg = {
4935                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4936                 .rpc_argp = &args,
4937                 .rpc_resp = &res,
4938         };
4939
4940         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4941 }
4942
4943 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4944 {
4945         struct nfs4_exception exception = {
4946                 .interruptible = true,
4947         };
4948         unsigned long now = jiffies;
4949         int err;
4950
4951         do {
4952                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4953                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4954                 if (err == 0) {
4955                         nfs4_set_lease_period(server->nfs_client,
4956                                         fsinfo->lease_time * HZ,
4957                                         now);
4958                         break;
4959                 }
4960                 err = nfs4_handle_exception(server, err, &exception);
4961         } while (exception.retry);
4962         return err;
4963 }
4964
4965 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4966 {
4967         int error;
4968
4969         nfs_fattr_init(fsinfo->fattr);
4970         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4971         if (error == 0) {
4972                 /* block layout checks this! */
4973                 server->pnfs_blksize = fsinfo->blksize;
4974                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
4975         }
4976
4977         return error;
4978 }
4979
4980 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4981                 struct nfs_pathconf *pathconf)
4982 {
4983         struct nfs4_pathconf_arg args = {
4984                 .fh = fhandle,
4985                 .bitmask = server->attr_bitmask,
4986         };
4987         struct nfs4_pathconf_res res = {
4988                 .pathconf = pathconf,
4989         };
4990         struct rpc_message msg = {
4991                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4992                 .rpc_argp = &args,
4993                 .rpc_resp = &res,
4994         };
4995
4996         /* None of the pathconf attributes are mandatory to implement */
4997         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4998                 memset(pathconf, 0, sizeof(*pathconf));
4999                 return 0;
5000         }
5001
5002         nfs_fattr_init(pathconf->fattr);
5003         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5004 }
5005
5006 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5007                 struct nfs_pathconf *pathconf)
5008 {
5009         struct nfs4_exception exception = {
5010                 .interruptible = true,
5011         };
5012         int err;
5013
5014         do {
5015                 err = nfs4_handle_exception(server,
5016                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5017                                 &exception);
5018         } while (exception.retry);
5019         return err;
5020 }
5021
5022 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5023                 const struct nfs_open_context *ctx,
5024                 const struct nfs_lock_context *l_ctx,
5025                 fmode_t fmode)
5026 {
5027         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5028 }
5029 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5030
5031 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5032                 const struct nfs_open_context *ctx,
5033                 const struct nfs_lock_context *l_ctx,
5034                 fmode_t fmode)
5035 {
5036         nfs4_stateid current_stateid;
5037
5038         /* If the current stateid represents a lost lock, then exit */
5039         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
5040                 return true;
5041         return nfs4_stateid_match(stateid, &current_stateid);
5042 }
5043
5044 static bool nfs4_error_stateid_expired(int err)
5045 {
5046         switch (err) {
5047         case -NFS4ERR_DELEG_REVOKED:
5048         case -NFS4ERR_ADMIN_REVOKED:
5049         case -NFS4ERR_BAD_STATEID:
5050         case -NFS4ERR_STALE_STATEID:
5051         case -NFS4ERR_OLD_STATEID:
5052         case -NFS4ERR_OPENMODE:
5053         case -NFS4ERR_EXPIRED:
5054                 return true;
5055         }
5056         return false;
5057 }
5058
5059 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5060 {
5061         struct nfs_server *server = NFS_SERVER(hdr->inode);
5062
5063         trace_nfs4_read(hdr, task->tk_status);
5064         if (task->tk_status < 0) {
5065                 struct nfs4_exception exception = {
5066                         .inode = hdr->inode,
5067                         .state = hdr->args.context->state,
5068                         .stateid = &hdr->args.stateid,
5069                 };
5070                 task->tk_status = nfs4_async_handle_exception(task,
5071                                 server, task->tk_status, &exception);
5072                 if (exception.retry) {
5073                         rpc_restart_call_prepare(task);
5074                         return -EAGAIN;
5075                 }
5076         }
5077
5078         if (task->tk_status > 0)
5079                 renew_lease(server, hdr->timestamp);
5080         return 0;
5081 }
5082
5083 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5084                 struct nfs_pgio_args *args)
5085 {
5086
5087         if (!nfs4_error_stateid_expired(task->tk_status) ||
5088                 nfs4_stateid_is_current(&args->stateid,
5089                                 args->context,
5090                                 args->lock_context,
5091                                 FMODE_READ))
5092                 return false;
5093         rpc_restart_call_prepare(task);
5094         return true;
5095 }
5096
5097 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5098 {
5099
5100         dprintk("--> %s\n", __func__);
5101
5102         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5103                 return -EAGAIN;
5104         if (nfs4_read_stateid_changed(task, &hdr->args))
5105                 return -EAGAIN;
5106         if (task->tk_status > 0)
5107                 nfs_invalidate_atime(hdr->inode);
5108         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5109                                     nfs4_read_done_cb(task, hdr);
5110 }
5111
5112 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5113                                  struct rpc_message *msg)
5114 {
5115         hdr->timestamp   = jiffies;
5116         if (!hdr->pgio_done_cb)
5117                 hdr->pgio_done_cb = nfs4_read_done_cb;
5118         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5119         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5120 }
5121
5122 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5123                                       struct nfs_pgio_header *hdr)
5124 {
5125         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5126                         &hdr->args.seq_args,
5127                         &hdr->res.seq_res,
5128                         task))
5129                 return 0;
5130         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5131                                 hdr->args.lock_context,
5132                                 hdr->rw_mode) == -EIO)
5133                 return -EIO;
5134         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5135                 return -EIO;
5136         return 0;
5137 }
5138
5139 static int nfs4_write_done_cb(struct rpc_task *task,
5140                               struct nfs_pgio_header *hdr)
5141 {
5142         struct inode *inode = hdr->inode;
5143
5144         trace_nfs4_write(hdr, task->tk_status);
5145         if (task->tk_status < 0) {
5146                 struct nfs4_exception exception = {
5147                         .inode = hdr->inode,
5148                         .state = hdr->args.context->state,
5149                         .stateid = &hdr->args.stateid,
5150                 };
5151                 task->tk_status = nfs4_async_handle_exception(task,
5152                                 NFS_SERVER(inode), task->tk_status,
5153                                 &exception);
5154                 if (exception.retry) {
5155                         rpc_restart_call_prepare(task);
5156                         return -EAGAIN;
5157                 }
5158         }
5159         if (task->tk_status >= 0) {
5160                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5161                 nfs_writeback_update_inode(hdr);
5162         }
5163         return 0;
5164 }
5165
5166 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5167                 struct nfs_pgio_args *args)
5168 {
5169
5170         if (!nfs4_error_stateid_expired(task->tk_status) ||
5171                 nfs4_stateid_is_current(&args->stateid,
5172                                 args->context,
5173                                 args->lock_context,
5174                                 FMODE_WRITE))
5175                 return false;
5176         rpc_restart_call_prepare(task);
5177         return true;
5178 }
5179
5180 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5181 {
5182         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5183                 return -EAGAIN;
5184         if (nfs4_write_stateid_changed(task, &hdr->args))
5185                 return -EAGAIN;
5186         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5187                 nfs4_write_done_cb(task, hdr);
5188 }
5189
5190 static
5191 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5192 {
5193         /* Don't request attributes for pNFS or O_DIRECT writes */
5194         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5195                 return false;
5196         /* Otherwise, request attributes if and only if we don't hold
5197          * a delegation
5198          */
5199         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5200 }
5201
5202 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5203                                   struct rpc_message *msg,
5204                                   struct rpc_clnt **clnt)
5205 {
5206         struct nfs_server *server = NFS_SERVER(hdr->inode);
5207
5208         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5209                 hdr->args.bitmask = NULL;
5210                 hdr->res.fattr = NULL;
5211         } else
5212                 hdr->args.bitmask = server->cache_consistency_bitmask;
5213
5214         if (!hdr->pgio_done_cb)
5215                 hdr->pgio_done_cb = nfs4_write_done_cb;
5216         hdr->res.server = server;
5217         hdr->timestamp   = jiffies;
5218
5219         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5220         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1, 0);
5221         nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5222 }
5223
5224 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5225 {
5226         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5227                         &data->args.seq_args,
5228                         &data->res.seq_res,
5229                         task);
5230 }
5231
5232 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5233 {
5234         struct inode *inode = data->inode;
5235
5236         trace_nfs4_commit(data, task->tk_status);
5237         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5238                                     NULL, NULL) == -EAGAIN) {
5239                 rpc_restart_call_prepare(task);
5240                 return -EAGAIN;
5241         }
5242         return 0;
5243 }
5244
5245 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5246 {
5247         if (!nfs4_sequence_done(task, &data->res.seq_res))
5248                 return -EAGAIN;
5249         return data->commit_done_cb(task, data);
5250 }
5251
5252 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5253                                    struct rpc_clnt **clnt)
5254 {
5255         struct nfs_server *server = NFS_SERVER(data->inode);
5256
5257         if (data->commit_done_cb == NULL)
5258                 data->commit_done_cb = nfs4_commit_done_cb;
5259         data->res.server = server;
5260         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5261         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5262         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5263 }
5264
5265 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5266                                 struct nfs_commitres *res)
5267 {
5268         struct inode *dst_inode = file_inode(dst);
5269         struct nfs_server *server = NFS_SERVER(dst_inode);
5270         struct rpc_message msg = {
5271                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5272                 .rpc_argp = args,
5273                 .rpc_resp = res,
5274         };
5275
5276         args->fh = NFS_FH(dst_inode);
5277         return nfs4_call_sync(server->client, server, &msg,
5278                         &args->seq_args, &res->seq_res, 1);
5279 }
5280
5281 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5282 {
5283         struct nfs_commitargs args = {
5284                 .offset = offset,
5285                 .count = count,
5286         };
5287         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5288         struct nfs4_exception exception = { };
5289         int status;
5290
5291         do {
5292                 status = _nfs4_proc_commit(dst, &args, res);
5293                 status = nfs4_handle_exception(dst_server, status, &exception);
5294         } while (exception.retry);
5295
5296         return status;
5297 }
5298
5299 struct nfs4_renewdata {
5300         struct nfs_client       *client;
5301         unsigned long           timestamp;
5302 };
5303
5304 /*
5305  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5306  * standalone procedure for queueing an asynchronous RENEW.
5307  */
5308 static void nfs4_renew_release(void *calldata)
5309 {
5310         struct nfs4_renewdata *data = calldata;
5311         struct nfs_client *clp = data->client;
5312
5313         if (refcount_read(&clp->cl_count) > 1)
5314                 nfs4_schedule_state_renewal(clp);
5315         nfs_put_client(clp);
5316         kfree(data);
5317 }
5318
5319 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5320 {
5321         struct nfs4_renewdata *data = calldata;
5322         struct nfs_client *clp = data->client;
5323         unsigned long timestamp = data->timestamp;
5324
5325         trace_nfs4_renew_async(clp, task->tk_status);
5326         switch (task->tk_status) {
5327         case 0:
5328                 break;
5329         case -NFS4ERR_LEASE_MOVED:
5330                 nfs4_schedule_lease_moved_recovery(clp);
5331                 break;
5332         default:
5333                 /* Unless we're shutting down, schedule state recovery! */
5334                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5335                         return;
5336                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5337                         nfs4_schedule_lease_recovery(clp);
5338                         return;
5339                 }
5340                 nfs4_schedule_path_down_recovery(clp);
5341         }
5342         do_renew_lease(clp, timestamp);
5343 }
5344
5345 static const struct rpc_call_ops nfs4_renew_ops = {
5346         .rpc_call_done = nfs4_renew_done,
5347         .rpc_release = nfs4_renew_release,
5348 };
5349
5350 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5351 {
5352         struct rpc_message msg = {
5353                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5354                 .rpc_argp       = clp,
5355                 .rpc_cred       = cred,
5356         };
5357         struct nfs4_renewdata *data;
5358
5359         if (renew_flags == 0)
5360                 return 0;
5361         if (!refcount_inc_not_zero(&clp->cl_count))
5362                 return -EIO;
5363         data = kmalloc(sizeof(*data), GFP_NOFS);
5364         if (data == NULL) {
5365                 nfs_put_client(clp);
5366                 return -ENOMEM;
5367         }
5368         data->client = clp;
5369         data->timestamp = jiffies;
5370         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5371                         &nfs4_renew_ops, data);
5372 }
5373
5374 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5375 {
5376         struct rpc_message msg = {
5377                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5378                 .rpc_argp       = clp,
5379                 .rpc_cred       = cred,
5380         };
5381         unsigned long now = jiffies;
5382         int status;
5383
5384         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5385         if (status < 0)
5386                 return status;
5387         do_renew_lease(clp, now);
5388         return 0;
5389 }
5390
5391 static inline int nfs4_server_supports_acls(struct nfs_server *server)
5392 {
5393         return server->caps & NFS_CAP_ACLS;
5394 }
5395
5396 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5397  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5398  * the stack.
5399  */
5400 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5401
5402 static int buf_to_pages_noslab(const void *buf, size_t buflen,
5403                 struct page **pages)
5404 {
5405         struct page *newpage, **spages;
5406         int rc = 0;
5407         size_t len;
5408         spages = pages;
5409
5410         do {
5411                 len = min_t(size_t, PAGE_SIZE, buflen);
5412                 newpage = alloc_page(GFP_KERNEL);
5413
5414                 if (newpage == NULL)
5415                         goto unwind;
5416                 memcpy(page_address(newpage), buf, len);
5417                 buf += len;
5418                 buflen -= len;
5419                 *pages++ = newpage;
5420                 rc++;
5421         } while (buflen != 0);
5422
5423         return rc;
5424
5425 unwind:
5426         for(; rc > 0; rc--)
5427                 __free_page(spages[rc-1]);
5428         return -ENOMEM;
5429 }
5430
5431 struct nfs4_cached_acl {
5432         int cached;
5433         size_t len;
5434         char data[0];
5435 };
5436
5437 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5438 {
5439         struct nfs_inode *nfsi = NFS_I(inode);
5440
5441         spin_lock(&inode->i_lock);
5442         kfree(nfsi->nfs4_acl);
5443         nfsi->nfs4_acl = acl;
5444         spin_unlock(&inode->i_lock);
5445 }
5446
5447 static void nfs4_zap_acl_attr(struct inode *inode)
5448 {
5449         nfs4_set_cached_acl(inode, NULL);
5450 }
5451
5452 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
5453 {
5454         struct nfs_inode *nfsi = NFS_I(inode);
5455         struct nfs4_cached_acl *acl;
5456         int ret = -ENOENT;
5457
5458         spin_lock(&inode->i_lock);
5459         acl = nfsi->nfs4_acl;
5460         if (acl == NULL)
5461                 goto out;
5462         if (buf == NULL) /* user is just asking for length */
5463                 goto out_len;
5464         if (acl->cached == 0)
5465                 goto out;
5466         ret = -ERANGE; /* see getxattr(2) man page */
5467         if (acl->len > buflen)
5468                 goto out;
5469         memcpy(buf, acl->data, acl->len);
5470 out_len:
5471         ret = acl->len;
5472 out:
5473         spin_unlock(&inode->i_lock);
5474         return ret;
5475 }
5476
5477 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
5478 {
5479         struct nfs4_cached_acl *acl;
5480         size_t buflen = sizeof(*acl) + acl_len;
5481
5482         if (buflen <= PAGE_SIZE) {
5483                 acl = kmalloc(buflen, GFP_KERNEL);
5484                 if (acl == NULL)
5485                         goto out;
5486                 acl->cached = 1;
5487                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5488         } else {
5489                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5490                 if (acl == NULL)
5491                         goto out;
5492                 acl->cached = 0;
5493         }
5494         acl->len = acl_len;
5495 out:
5496         nfs4_set_cached_acl(inode, acl);
5497 }
5498
5499 /*
5500  * The getxattr API returns the required buffer length when called with a
5501  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5502  * the required buf.  On a NULL buf, we send a page of data to the server
5503  * guessing that the ACL request can be serviced by a page. If so, we cache
5504  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5505  * the cache. If not so, we throw away the page, and cache the required
5506  * length. The next getxattr call will then produce another round trip to
5507  * the server, this time with the input buf of the required size.
5508  */
5509 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5510 {
5511         struct page *pages[NFS4ACL_MAXPAGES + 1] = {NULL, };
5512         struct nfs_getaclargs args = {
5513                 .fh = NFS_FH(inode),
5514                 .acl_pages = pages,
5515                 .acl_len = buflen,
5516         };
5517         struct nfs_getaclres res = {
5518                 .acl_len = buflen,
5519         };
5520         struct rpc_message msg = {
5521                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5522                 .rpc_argp = &args,
5523                 .rpc_resp = &res,
5524         };
5525         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5526         int ret = -ENOMEM, i;
5527
5528         if (npages > ARRAY_SIZE(pages))
5529                 return -ERANGE;
5530
5531         for (i = 0; i < npages; i++) {
5532                 pages[i] = alloc_page(GFP_KERNEL);
5533                 if (!pages[i])
5534                         goto out_free;
5535         }
5536
5537         /* for decoding across pages */
5538         res.acl_scratch = alloc_page(GFP_KERNEL);
5539         if (!res.acl_scratch)
5540                 goto out_free;
5541
5542         args.acl_len = npages * PAGE_SIZE;
5543
5544         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5545                 __func__, buf, buflen, npages, args.acl_len);
5546         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5547                              &msg, &args.seq_args, &res.seq_res, 0);
5548         if (ret)
5549                 goto out_free;
5550
5551         /* Handle the case where the passed-in buffer is too short */
5552         if (res.acl_flags & NFS4_ACL_TRUNC) {
5553                 /* Did the user only issue a request for the acl length? */
5554                 if (buf == NULL)
5555                         goto out_ok;
5556                 ret = -ERANGE;
5557                 goto out_free;
5558         }
5559         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
5560         if (buf) {
5561                 if (res.acl_len > buflen) {
5562                         ret = -ERANGE;
5563                         goto out_free;
5564                 }
5565                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5566         }
5567 out_ok:
5568         ret = res.acl_len;
5569 out_free:
5570         for (i = 0; i < npages; i++)
5571                 if (pages[i])
5572                         __free_page(pages[i]);
5573         if (res.acl_scratch)
5574                 __free_page(res.acl_scratch);
5575         return ret;
5576 }
5577
5578 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5579 {
5580         struct nfs4_exception exception = {
5581                 .interruptible = true,
5582         };
5583         ssize_t ret;
5584         do {
5585                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
5586                 trace_nfs4_get_acl(inode, ret);
5587                 if (ret >= 0)
5588                         break;
5589                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
5590         } while (exception.retry);
5591         return ret;
5592 }
5593
5594 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
5595 {
5596         struct nfs_server *server = NFS_SERVER(inode);
5597         int ret;
5598
5599         if (!nfs4_server_supports_acls(server))
5600                 return -EOPNOTSUPP;
5601         ret = nfs_revalidate_inode(server, inode);
5602         if (ret < 0)
5603                 return ret;
5604         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
5605                 nfs_zap_acl_cache(inode);
5606         ret = nfs4_read_cached_acl(inode, buf, buflen);
5607         if (ret != -ENOENT)
5608                 /* -ENOENT is returned if there is no ACL or if there is an ACL
5609                  * but no cached acl data, just the acl length */
5610                 return ret;
5611         return nfs4_get_acl_uncached(inode, buf, buflen);
5612 }
5613
5614 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5615 {
5616         struct nfs_server *server = NFS_SERVER(inode);
5617         struct page *pages[NFS4ACL_MAXPAGES];
5618         struct nfs_setaclargs arg = {
5619                 .fh             = NFS_FH(inode),
5620                 .acl_pages      = pages,
5621                 .acl_len        = buflen,
5622         };
5623         struct nfs_setaclres res;
5624         struct rpc_message msg = {
5625                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
5626                 .rpc_argp       = &arg,
5627                 .rpc_resp       = &res,
5628         };
5629         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5630         int ret, i;
5631
5632         if (!nfs4_server_supports_acls(server))
5633                 return -EOPNOTSUPP;
5634         if (npages > ARRAY_SIZE(pages))
5635                 return -ERANGE;
5636         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
5637         if (i < 0)
5638                 return i;
5639         nfs4_inode_make_writeable(inode);
5640         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5641
5642         /*
5643          * Free each page after tx, so the only ref left is
5644          * held by the network stack
5645          */
5646         for (; i > 0; i--)
5647                 put_page(pages[i-1]);
5648
5649         /*
5650          * Acl update can result in inode attribute update.
5651          * so mark the attribute cache invalid.
5652          */
5653         spin_lock(&inode->i_lock);
5654         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE
5655                 | NFS_INO_INVALID_CTIME
5656                 | NFS_INO_REVAL_FORCED;
5657         spin_unlock(&inode->i_lock);
5658         nfs_access_zap_cache(inode);
5659         nfs_zap_acl_cache(inode);
5660         return ret;
5661 }
5662
5663 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5664 {
5665         struct nfs4_exception exception = { };
5666         int err;
5667         do {
5668                 err = __nfs4_proc_set_acl(inode, buf, buflen);
5669                 trace_nfs4_set_acl(inode, err);
5670                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5671                                 &exception);
5672         } while (exception.retry);
5673         return err;
5674 }
5675
5676 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5677 static int _nfs4_get_security_label(struct inode *inode, void *buf,
5678                                         size_t buflen)
5679 {
5680         struct nfs_server *server = NFS_SERVER(inode);
5681         struct nfs_fattr fattr;
5682         struct nfs4_label label = {0, 0, buflen, buf};
5683
5684         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5685         struct nfs4_getattr_arg arg = {
5686                 .fh             = NFS_FH(inode),
5687                 .bitmask        = bitmask,
5688         };
5689         struct nfs4_getattr_res res = {
5690                 .fattr          = &fattr,
5691                 .label          = &label,
5692                 .server         = server,
5693         };
5694         struct rpc_message msg = {
5695                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
5696                 .rpc_argp       = &arg,
5697                 .rpc_resp       = &res,
5698         };
5699         int ret;
5700
5701         nfs_fattr_init(&fattr);
5702
5703         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
5704         if (ret)
5705                 return ret;
5706         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
5707                 return -ENOENT;
5708         if (buflen < label.len)
5709                 return -ERANGE;
5710         return 0;
5711 }
5712
5713 static int nfs4_get_security_label(struct inode *inode, void *buf,
5714                                         size_t buflen)
5715 {
5716         struct nfs4_exception exception = {
5717                 .interruptible = true,
5718         };
5719         int err;
5720
5721         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5722                 return -EOPNOTSUPP;
5723
5724         do {
5725                 err = _nfs4_get_security_label(inode, buf, buflen);
5726                 trace_nfs4_get_security_label(inode, err);
5727                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5728                                 &exception);
5729         } while (exception.retry);
5730         return err;
5731 }
5732
5733 static int _nfs4_do_set_security_label(struct inode *inode,
5734                 struct nfs4_label *ilabel,
5735                 struct nfs_fattr *fattr,
5736                 struct nfs4_label *olabel)
5737 {
5738
5739         struct iattr sattr = {0};
5740         struct nfs_server *server = NFS_SERVER(inode);
5741         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5742         struct nfs_setattrargs arg = {
5743                 .fh             = NFS_FH(inode),
5744                 .iap            = &sattr,
5745                 .server         = server,
5746                 .bitmask        = bitmask,
5747                 .label          = ilabel,
5748         };
5749         struct nfs_setattrres res = {
5750                 .fattr          = fattr,
5751                 .label          = olabel,
5752                 .server         = server,
5753         };
5754         struct rpc_message msg = {
5755                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
5756                 .rpc_argp       = &arg,
5757                 .rpc_resp       = &res,
5758         };
5759         int status;
5760
5761         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
5762
5763         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5764         if (status)
5765                 dprintk("%s failed: %d\n", __func__, status);
5766
5767         return status;
5768 }
5769
5770 static int nfs4_do_set_security_label(struct inode *inode,
5771                 struct nfs4_label *ilabel,
5772                 struct nfs_fattr *fattr,
5773                 struct nfs4_label *olabel)
5774 {
5775         struct nfs4_exception exception = { };
5776         int err;
5777
5778         do {
5779                 err = _nfs4_do_set_security_label(inode, ilabel,
5780                                 fattr, olabel);
5781                 trace_nfs4_set_security_label(inode, err);
5782                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5783                                 &exception);
5784         } while (exception.retry);
5785         return err;
5786 }
5787
5788 static int
5789 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5790 {
5791         struct nfs4_label ilabel, *olabel = NULL;
5792         struct nfs_fattr fattr;
5793         int status;
5794
5795         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5796                 return -EOPNOTSUPP;
5797
5798         nfs_fattr_init(&fattr);
5799
5800         ilabel.pi = 0;
5801         ilabel.lfs = 0;
5802         ilabel.label = (char *)buf;
5803         ilabel.len = buflen;
5804
5805         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5806         if (IS_ERR(olabel)) {
5807                 status = -PTR_ERR(olabel);
5808                 goto out;
5809         }
5810
5811         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5812         if (status == 0)
5813                 nfs_setsecurity(inode, &fattr, olabel);
5814
5815         nfs4_label_free(olabel);
5816 out:
5817         return status;
5818 }
5819 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5820
5821
5822 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5823                                     nfs4_verifier *bootverf)
5824 {
5825         __be32 verf[2];
5826
5827         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5828                 /* An impossible timestamp guarantees this value
5829                  * will never match a generated boot time. */
5830                 verf[0] = cpu_to_be32(U32_MAX);
5831                 verf[1] = cpu_to_be32(U32_MAX);
5832         } else {
5833                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5834                 u64 ns = ktime_to_ns(nn->boot_time);
5835
5836                 verf[0] = cpu_to_be32(ns >> 32);
5837                 verf[1] = cpu_to_be32(ns);
5838         }
5839         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5840 }
5841
5842 static int
5843 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5844 {
5845         size_t len;
5846         char *str;
5847
5848         if (clp->cl_owner_id != NULL)
5849                 return 0;
5850
5851         rcu_read_lock();
5852         len = 14 +
5853                 strlen(clp->cl_rpcclient->cl_nodename) +
5854                 1 +
5855                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5856                 1;
5857         rcu_read_unlock();
5858         if (nfs4_client_id_uniquifier[0] != '\0')
5859                 len += strlen(nfs4_client_id_uniquifier) + 1;
5860         if (len > NFS4_OPAQUE_LIMIT + 1)
5861                 return -EINVAL;
5862
5863         /*
5864          * Since this string is allocated at mount time, and held until the
5865          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5866          * about a memory-reclaim deadlock.
5867          */
5868         str = kmalloc(len, GFP_KERNEL);
5869         if (!str)
5870                 return -ENOMEM;
5871
5872         rcu_read_lock();
5873         if (nfs4_client_id_uniquifier[0] != '\0')
5874                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
5875                           clp->cl_rpcclient->cl_nodename,
5876                           nfs4_client_id_uniquifier,
5877                           rpc_peeraddr2str(clp->cl_rpcclient,
5878                                            RPC_DISPLAY_ADDR));
5879         else
5880                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
5881                           clp->cl_rpcclient->cl_nodename,
5882                           rpc_peeraddr2str(clp->cl_rpcclient,
5883                                            RPC_DISPLAY_ADDR));
5884         rcu_read_unlock();
5885
5886         clp->cl_owner_id = str;
5887         return 0;
5888 }
5889
5890 static int
5891 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5892 {
5893         size_t len;
5894         char *str;
5895
5896         len = 10 + 10 + 1 + 10 + 1 +
5897                 strlen(nfs4_client_id_uniquifier) + 1 +
5898                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5899
5900         if (len > NFS4_OPAQUE_LIMIT + 1)
5901                 return -EINVAL;
5902
5903         /*
5904          * Since this string is allocated at mount time, and held until the
5905          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5906          * about a memory-reclaim deadlock.
5907          */
5908         str = kmalloc(len, GFP_KERNEL);
5909         if (!str)
5910                 return -ENOMEM;
5911
5912         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5913                         clp->rpc_ops->version, clp->cl_minorversion,
5914                         nfs4_client_id_uniquifier,
5915                         clp->cl_rpcclient->cl_nodename);
5916         clp->cl_owner_id = str;
5917         return 0;
5918 }
5919
5920 static int
5921 nfs4_init_uniform_client_string(struct nfs_client *clp)
5922 {
5923         size_t len;
5924         char *str;
5925
5926         if (clp->cl_owner_id != NULL)
5927                 return 0;
5928
5929         if (nfs4_client_id_uniquifier[0] != '\0')
5930                 return nfs4_init_uniquifier_client_string(clp);
5931
5932         len = 10 + 10 + 1 + 10 + 1 +
5933                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5934
5935         if (len > NFS4_OPAQUE_LIMIT + 1)
5936                 return -EINVAL;
5937
5938         /*
5939          * Since this string is allocated at mount time, and held until the
5940          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5941          * about a memory-reclaim deadlock.
5942          */
5943         str = kmalloc(len, GFP_KERNEL);
5944         if (!str)
5945                 return -ENOMEM;
5946
5947         scnprintf(str, len, "Linux NFSv%u.%u %s",
5948                         clp->rpc_ops->version, clp->cl_minorversion,
5949                         clp->cl_rpcclient->cl_nodename);
5950         clp->cl_owner_id = str;
5951         return 0;
5952 }
5953
5954 /*
5955  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5956  * services.  Advertise one based on the address family of the
5957  * clientaddr.
5958  */
5959 static unsigned int
5960 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5961 {
5962         if (strchr(clp->cl_ipaddr, ':') != NULL)
5963                 return scnprintf(buf, len, "tcp6");
5964         else
5965                 return scnprintf(buf, len, "tcp");
5966 }
5967
5968 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5969 {
5970         struct nfs4_setclientid *sc = calldata;
5971
5972         if (task->tk_status == 0)
5973                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5974 }
5975
5976 static const struct rpc_call_ops nfs4_setclientid_ops = {
5977         .rpc_call_done = nfs4_setclientid_done,
5978 };
5979
5980 /**
5981  * nfs4_proc_setclientid - Negotiate client ID
5982  * @clp: state data structure
5983  * @program: RPC program for NFSv4 callback service
5984  * @port: IP port number for NFS4 callback service
5985  * @cred: credential to use for this call
5986  * @res: where to place the result
5987  *
5988  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5989  */
5990 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5991                 unsigned short port, const struct cred *cred,
5992                 struct nfs4_setclientid_res *res)
5993 {
5994         nfs4_verifier sc_verifier;
5995         struct nfs4_setclientid setclientid = {
5996                 .sc_verifier = &sc_verifier,
5997                 .sc_prog = program,
5998                 .sc_clnt = clp,
5999         };
6000         struct rpc_message msg = {
6001                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6002                 .rpc_argp = &setclientid,
6003                 .rpc_resp = res,
6004                 .rpc_cred = cred,
6005         };
6006         struct rpc_task *task;
6007         struct rpc_task_setup task_setup_data = {
6008                 .rpc_client = clp->cl_rpcclient,
6009                 .rpc_message = &msg,
6010                 .callback_ops = &nfs4_setclientid_ops,
6011                 .callback_data = &setclientid,
6012                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6013         };
6014         int status;
6015
6016         /* nfs_client_id4 */
6017         nfs4_init_boot_verifier(clp, &sc_verifier);
6018
6019         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6020                 status = nfs4_init_uniform_client_string(clp);
6021         else
6022                 status = nfs4_init_nonuniform_client_string(clp);
6023
6024         if (status)
6025                 goto out;
6026
6027         /* cb_client4 */
6028         setclientid.sc_netid_len =
6029                                 nfs4_init_callback_netid(clp,
6030                                                 setclientid.sc_netid,
6031                                                 sizeof(setclientid.sc_netid));
6032         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6033                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6034                                 clp->cl_ipaddr, port >> 8, port & 255);
6035
6036         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6037                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6038                 clp->cl_owner_id);
6039         task = rpc_run_task(&task_setup_data);
6040         if (IS_ERR(task)) {
6041                 status = PTR_ERR(task);
6042                 goto out;
6043         }
6044         status = task->tk_status;
6045         if (setclientid.sc_cred) {
6046                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6047                 put_rpccred(setclientid.sc_cred);
6048         }
6049         rpc_put_task(task);
6050 out:
6051         trace_nfs4_setclientid(clp, status);
6052         dprintk("NFS reply setclientid: %d\n", status);
6053         return status;
6054 }
6055
6056 /**
6057  * nfs4_proc_setclientid_confirm - Confirm client ID
6058  * @clp: state data structure
6059  * @arg: result of a previous SETCLIENTID
6060  * @cred: credential to use for this call
6061  *
6062  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6063  */
6064 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6065                 struct nfs4_setclientid_res *arg,
6066                 const struct cred *cred)
6067 {
6068         struct rpc_message msg = {
6069                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6070                 .rpc_argp = arg,
6071                 .rpc_cred = cred,
6072         };
6073         int status;
6074
6075         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6076                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6077                 clp->cl_clientid);
6078         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6079                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6080         trace_nfs4_setclientid_confirm(clp, status);
6081         dprintk("NFS reply setclientid_confirm: %d\n", status);
6082         return status;
6083 }
6084
6085 struct nfs4_delegreturndata {
6086         struct nfs4_delegreturnargs args;
6087         struct nfs4_delegreturnres res;
6088         struct nfs_fh fh;
6089         nfs4_stateid stateid;
6090         unsigned long timestamp;
6091         struct {
6092                 struct nfs4_layoutreturn_args arg;
6093                 struct nfs4_layoutreturn_res res;
6094                 struct nfs4_xdr_opaque_data ld_private;
6095                 u32 roc_barrier;
6096                 bool roc;
6097         } lr;
6098         struct nfs_fattr fattr;
6099         int rpc_status;
6100         struct inode *inode;
6101 };
6102
6103 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6104 {
6105         struct nfs4_delegreturndata *data = calldata;
6106         struct nfs4_exception exception = {
6107                 .inode = data->inode,
6108                 .stateid = &data->stateid,
6109         };
6110
6111         if (!nfs4_sequence_done(task, &data->res.seq_res))
6112                 return;
6113
6114         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6115
6116         /* Handle Layoutreturn errors */
6117         if (data->args.lr_args && task->tk_status != 0) {
6118                 switch(data->res.lr_ret) {
6119                 default:
6120                         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6121                         break;
6122                 case 0:
6123                         data->args.lr_args = NULL;
6124                         data->res.lr_res = NULL;
6125                         break;
6126                 case -NFS4ERR_OLD_STATEID:
6127                         if (nfs4_layoutreturn_refresh_stateid(&data->args.lr_args->stateid,
6128                                                 &data->args.lr_args->range,
6129                                                 data->inode))
6130                                 goto lr_restart;
6131                         /* Fallthrough */
6132                 case -NFS4ERR_ADMIN_REVOKED:
6133                 case -NFS4ERR_DELEG_REVOKED:
6134                 case -NFS4ERR_EXPIRED:
6135                 case -NFS4ERR_BAD_STATEID:
6136                 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
6137                 case -NFS4ERR_WRONG_CRED:
6138                         data->args.lr_args = NULL;
6139                         data->res.lr_res = NULL;
6140                         goto lr_restart;
6141                 }
6142         }
6143
6144         switch (task->tk_status) {
6145         case 0:
6146                 renew_lease(data->res.server, data->timestamp);
6147                 break;
6148         case -NFS4ERR_ADMIN_REVOKED:
6149         case -NFS4ERR_DELEG_REVOKED:
6150         case -NFS4ERR_EXPIRED:
6151                 nfs4_free_revoked_stateid(data->res.server,
6152                                 data->args.stateid,
6153                                 task->tk_msg.rpc_cred);
6154                 /* Fallthrough */
6155         case -NFS4ERR_BAD_STATEID:
6156         case -NFS4ERR_STALE_STATEID:
6157                 task->tk_status = 0;
6158                 break;
6159         case -NFS4ERR_OLD_STATEID:
6160                 if (nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6161                         goto out_restart;
6162                 task->tk_status = 0;
6163                 break;
6164         case -NFS4ERR_ACCESS:
6165                 if (data->args.bitmask) {
6166                         data->args.bitmask = NULL;
6167                         data->res.fattr = NULL;
6168                         goto out_restart;
6169                 }
6170                 /* Fallthrough */
6171         default:
6172                 task->tk_status = nfs4_async_handle_exception(task,
6173                                 data->res.server, task->tk_status,
6174                                 &exception);
6175                 if (exception.retry)
6176                         goto out_restart;
6177         }
6178         data->rpc_status = task->tk_status;
6179         return;
6180 lr_restart:
6181         data->res.lr_ret = 0;
6182 out_restart:
6183         task->tk_status = 0;
6184         rpc_restart_call_prepare(task);
6185 }
6186
6187 static void nfs4_delegreturn_release(void *calldata)
6188 {
6189         struct nfs4_delegreturndata *data = calldata;
6190         struct inode *inode = data->inode;
6191
6192         if (inode) {
6193                 if (data->lr.roc)
6194                         pnfs_roc_release(&data->lr.arg, &data->lr.res,
6195                                         data->res.lr_ret);
6196                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
6197                 nfs_iput_and_deactive(inode);
6198         }
6199         kfree(calldata);
6200 }
6201
6202 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6203 {
6204         struct nfs4_delegreturndata *d_data;
6205         struct pnfs_layout_hdr *lo;
6206
6207         d_data = (struct nfs4_delegreturndata *)data;
6208
6209         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task))
6210                 return;
6211
6212         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6213         if (lo && !pnfs_layout_is_valid(lo)) {
6214                 d_data->args.lr_args = NULL;
6215                 d_data->res.lr_res = NULL;
6216         }
6217
6218         nfs4_setup_sequence(d_data->res.server->nfs_client,
6219                         &d_data->args.seq_args,
6220                         &d_data->res.seq_res,
6221                         task);
6222 }
6223
6224 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6225         .rpc_call_prepare = nfs4_delegreturn_prepare,
6226         .rpc_call_done = nfs4_delegreturn_done,
6227         .rpc_release = nfs4_delegreturn_release,
6228 };
6229
6230 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6231 {
6232         struct nfs4_delegreturndata *data;
6233         struct nfs_server *server = NFS_SERVER(inode);
6234         struct rpc_task *task;
6235         struct rpc_message msg = {
6236                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6237                 .rpc_cred = cred,
6238         };
6239         struct rpc_task_setup task_setup_data = {
6240                 .rpc_client = server->client,
6241                 .rpc_message = &msg,
6242                 .callback_ops = &nfs4_delegreturn_ops,
6243                 .flags = RPC_TASK_ASYNC,
6244         };
6245         int status = 0;
6246
6247         data = kzalloc(sizeof(*data), GFP_NOFS);
6248         if (data == NULL)
6249                 return -ENOMEM;
6250         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
6251
6252         nfs4_state_protect(server->nfs_client,
6253                         NFS_SP4_MACH_CRED_CLEANUP,
6254                         &task_setup_data.rpc_client, &msg);
6255
6256         data->args.fhandle = &data->fh;
6257         data->args.stateid = &data->stateid;
6258         data->args.bitmask = server->cache_consistency_bitmask;
6259         nfs_copy_fh(&data->fh, NFS_FH(inode));
6260         nfs4_stateid_copy(&data->stateid, stateid);
6261         data->res.fattr = &data->fattr;
6262         data->res.server = server;
6263         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6264         data->lr.arg.ld_private = &data->lr.ld_private;
6265         nfs_fattr_init(data->res.fattr);
6266         data->timestamp = jiffies;
6267         data->rpc_status = 0;
6268         data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred);
6269         data->inode = nfs_igrab_and_active(inode);
6270         if (data->inode) {
6271                 if (data->lr.roc) {
6272                         data->args.lr_args = &data->lr.arg;
6273                         data->res.lr_res = &data->lr.res;
6274                 }
6275         } else if (data->lr.roc) {
6276                 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0);
6277                 data->lr.roc = false;
6278         }
6279
6280         task_setup_data.callback_data = data;
6281         msg.rpc_argp = &data->args;
6282         msg.rpc_resp = &data->res;
6283         task = rpc_run_task(&task_setup_data);
6284         if (IS_ERR(task))
6285                 return PTR_ERR(task);
6286         if (!issync)
6287                 goto out;
6288         status = rpc_wait_for_completion_task(task);
6289         if (status != 0)
6290                 goto out;
6291         status = data->rpc_status;
6292 out:
6293         rpc_put_task(task);
6294         return status;
6295 }
6296
6297 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6298 {
6299         struct nfs_server *server = NFS_SERVER(inode);
6300         struct nfs4_exception exception = { };
6301         int err;
6302         do {
6303                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6304                 trace_nfs4_delegreturn(inode, stateid, err);
6305                 switch (err) {
6306                         case -NFS4ERR_STALE_STATEID:
6307                         case -NFS4ERR_EXPIRED:
6308                         case 0:
6309                                 return 0;
6310                 }
6311                 err = nfs4_handle_exception(server, err, &exception);
6312         } while (exception.retry);
6313         return err;
6314 }
6315
6316 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6317 {
6318         struct inode *inode = state->inode;
6319         struct nfs_server *server = NFS_SERVER(inode);
6320         struct nfs_client *clp = server->nfs_client;
6321         struct nfs_lockt_args arg = {
6322                 .fh = NFS_FH(inode),
6323                 .fl = request,
6324         };
6325         struct nfs_lockt_res res = {
6326                 .denied = request,
6327         };
6328         struct rpc_message msg = {
6329                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6330                 .rpc_argp       = &arg,
6331                 .rpc_resp       = &res,
6332                 .rpc_cred       = state->owner->so_cred,
6333         };
6334         struct nfs4_lock_state *lsp;
6335         int status;
6336
6337         arg.lock_owner.clientid = clp->cl_clientid;
6338         status = nfs4_set_lock_state(state, request);
6339         if (status != 0)
6340                 goto out;
6341         lsp = request->fl_u.nfs4_fl.owner;
6342         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6343         arg.lock_owner.s_dev = server->s_dev;
6344         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6345         switch (status) {
6346                 case 0:
6347                         request->fl_type = F_UNLCK;
6348                         break;
6349                 case -NFS4ERR_DENIED:
6350                         status = 0;
6351         }
6352         request->fl_ops->fl_release_private(request);
6353         request->fl_ops = NULL;
6354 out:
6355         return status;
6356 }
6357
6358 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6359 {
6360         struct nfs4_exception exception = {
6361                 .interruptible = true,
6362         };
6363         int err;
6364
6365         do {
6366                 err = _nfs4_proc_getlk(state, cmd, request);
6367                 trace_nfs4_get_lock(request, state, cmd, err);
6368                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6369                                 &exception);
6370         } while (exception.retry);
6371         return err;
6372 }
6373
6374 struct nfs4_unlockdata {
6375         struct nfs_locku_args arg;
6376         struct nfs_locku_res res;
6377         struct nfs4_lock_state *lsp;
6378         struct nfs_open_context *ctx;
6379         struct nfs_lock_context *l_ctx;
6380         struct file_lock fl;
6381         struct nfs_server *server;
6382         unsigned long timestamp;
6383 };
6384
6385 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6386                 struct nfs_open_context *ctx,
6387                 struct nfs4_lock_state *lsp,
6388                 struct nfs_seqid *seqid)
6389 {
6390         struct nfs4_unlockdata *p;
6391         struct inode *inode = lsp->ls_state->inode;
6392
6393         p = kzalloc(sizeof(*p), GFP_NOFS);
6394         if (p == NULL)
6395                 return NULL;
6396         p->arg.fh = NFS_FH(inode);
6397         p->arg.fl = &p->fl;
6398         p->arg.seqid = seqid;
6399         p->res.seqid = seqid;
6400         p->lsp = lsp;
6401         /* Ensure we don't close file until we're done freeing locks! */
6402         p->ctx = get_nfs_open_context(ctx);
6403         p->l_ctx = nfs_get_lock_context(ctx);
6404         locks_init_lock(&p->fl);
6405         locks_copy_lock(&p->fl, fl);
6406         p->server = NFS_SERVER(inode);
6407         return p;
6408 }
6409
6410 static void nfs4_locku_release_calldata(void *data)
6411 {
6412         struct nfs4_unlockdata *calldata = data;
6413         nfs_free_seqid(calldata->arg.seqid);
6414         nfs4_put_lock_state(calldata->lsp);
6415         nfs_put_lock_context(calldata->l_ctx);
6416         put_nfs_open_context(calldata->ctx);
6417         kfree(calldata);
6418 }
6419
6420 static void nfs4_locku_done(struct rpc_task *task, void *data)
6421 {
6422         struct nfs4_unlockdata *calldata = data;
6423         struct nfs4_exception exception = {
6424                 .inode = calldata->lsp->ls_state->inode,
6425                 .stateid = &calldata->arg.stateid,
6426         };
6427
6428         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6429                 return;
6430         switch (task->tk_status) {
6431                 case 0:
6432                         renew_lease(calldata->server, calldata->timestamp);
6433                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6434                         if (nfs4_update_lock_stateid(calldata->lsp,
6435                                         &calldata->res.stateid))
6436                                 break;
6437                         /* Fall through */
6438                 case -NFS4ERR_ADMIN_REVOKED:
6439                 case -NFS4ERR_EXPIRED:
6440                         nfs4_free_revoked_stateid(calldata->server,
6441                                         &calldata->arg.stateid,
6442                                         task->tk_msg.rpc_cred);
6443                         /* Fall through */
6444                 case -NFS4ERR_BAD_STATEID:
6445                 case -NFS4ERR_OLD_STATEID:
6446                 case -NFS4ERR_STALE_STATEID:
6447                         if (!nfs4_stateid_match(&calldata->arg.stateid,
6448                                                 &calldata->lsp->ls_stateid))
6449                                 rpc_restart_call_prepare(task);
6450                         break;
6451                 default:
6452                         task->tk_status = nfs4_async_handle_exception(task,
6453                                         calldata->server, task->tk_status,
6454                                         &exception);
6455                         if (exception.retry)
6456                                 rpc_restart_call_prepare(task);
6457         }
6458         nfs_release_seqid(calldata->arg.seqid);
6459 }
6460
6461 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6462 {
6463         struct nfs4_unlockdata *calldata = data;
6464
6465         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6466                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6467                 return;
6468
6469         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6470                 goto out_wait;
6471         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
6472         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6473                 /* Note: exit _without_ running nfs4_locku_done */
6474                 goto out_no_action;
6475         }
6476         calldata->timestamp = jiffies;
6477         if (nfs4_setup_sequence(calldata->server->nfs_client,
6478                                 &calldata->arg.seq_args,
6479                                 &calldata->res.seq_res,
6480                                 task) != 0)
6481                 nfs_release_seqid(calldata->arg.seqid);
6482         return;
6483 out_no_action:
6484         task->tk_action = NULL;
6485 out_wait:
6486         nfs4_sequence_done(task, &calldata->res.seq_res);
6487 }
6488
6489 static const struct rpc_call_ops nfs4_locku_ops = {
6490         .rpc_call_prepare = nfs4_locku_prepare,
6491         .rpc_call_done = nfs4_locku_done,
6492         .rpc_release = nfs4_locku_release_calldata,
6493 };
6494
6495 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6496                 struct nfs_open_context *ctx,
6497                 struct nfs4_lock_state *lsp,
6498                 struct nfs_seqid *seqid)
6499 {
6500         struct nfs4_unlockdata *data;
6501         struct rpc_message msg = {
6502                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6503                 .rpc_cred = ctx->cred,
6504         };
6505         struct rpc_task_setup task_setup_data = {
6506                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6507                 .rpc_message = &msg,
6508                 .callback_ops = &nfs4_locku_ops,
6509                 .workqueue = nfsiod_workqueue,
6510                 .flags = RPC_TASK_ASYNC,
6511         };
6512
6513         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6514                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6515
6516         /* Ensure this is an unlock - when canceling a lock, the
6517          * canceled lock is passed in, and it won't be an unlock.
6518          */
6519         fl->fl_type = F_UNLCK;
6520         if (fl->fl_flags & FL_CLOSE)
6521                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6522
6523         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6524         if (data == NULL) {
6525                 nfs_free_seqid(seqid);
6526                 return ERR_PTR(-ENOMEM);
6527         }
6528
6529         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
6530         msg.rpc_argp = &data->arg;
6531         msg.rpc_resp = &data->res;
6532         task_setup_data.callback_data = data;
6533         return rpc_run_task(&task_setup_data);
6534 }
6535
6536 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
6537 {
6538         struct inode *inode = state->inode;
6539         struct nfs4_state_owner *sp = state->owner;
6540         struct nfs_inode *nfsi = NFS_I(inode);
6541         struct nfs_seqid *seqid;
6542         struct nfs4_lock_state *lsp;
6543         struct rpc_task *task;
6544         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6545         int status = 0;
6546         unsigned char fl_flags = request->fl_flags;
6547
6548         status = nfs4_set_lock_state(state, request);
6549         /* Unlock _before_ we do the RPC call */
6550         request->fl_flags |= FL_EXISTS;
6551         /* Exclude nfs_delegation_claim_locks() */
6552         mutex_lock(&sp->so_delegreturn_mutex);
6553         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
6554         down_read(&nfsi->rwsem);
6555         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
6556                 up_read(&nfsi->rwsem);
6557                 mutex_unlock(&sp->so_delegreturn_mutex);
6558                 goto out;
6559         }
6560         up_read(&nfsi->rwsem);
6561         mutex_unlock(&sp->so_delegreturn_mutex);
6562         if (status != 0)
6563                 goto out;
6564         /* Is this a delegated lock? */
6565         lsp = request->fl_u.nfs4_fl.owner;
6566         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
6567                 goto out;
6568         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
6569         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
6570         status = -ENOMEM;
6571         if (IS_ERR(seqid))
6572                 goto out;
6573         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
6574         status = PTR_ERR(task);
6575         if (IS_ERR(task))
6576                 goto out;
6577         status = rpc_wait_for_completion_task(task);
6578         rpc_put_task(task);
6579 out:
6580         request->fl_flags = fl_flags;
6581         trace_nfs4_unlock(request, state, F_SETLK, status);
6582         return status;
6583 }
6584
6585 struct nfs4_lockdata {
6586         struct nfs_lock_args arg;
6587         struct nfs_lock_res res;
6588         struct nfs4_lock_state *lsp;
6589         struct nfs_open_context *ctx;
6590         struct file_lock fl;
6591         unsigned long timestamp;
6592         int rpc_status;
6593         int cancelled;
6594         struct nfs_server *server;
6595 };
6596
6597 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
6598                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
6599                 gfp_t gfp_mask)
6600 {
6601         struct nfs4_lockdata *p;
6602         struct inode *inode = lsp->ls_state->inode;
6603         struct nfs_server *server = NFS_SERVER(inode);
6604         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6605
6606         p = kzalloc(sizeof(*p), gfp_mask);
6607         if (p == NULL)
6608                 return NULL;
6609
6610         p->arg.fh = NFS_FH(inode);
6611         p->arg.fl = &p->fl;
6612         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
6613         if (IS_ERR(p->arg.open_seqid))
6614                 goto out_free;
6615         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
6616         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
6617         if (IS_ERR(p->arg.lock_seqid))
6618                 goto out_free_seqid;
6619         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
6620         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
6621         p->arg.lock_owner.s_dev = server->s_dev;
6622         p->res.lock_seqid = p->arg.lock_seqid;
6623         p->lsp = lsp;
6624         p->server = server;
6625         p->ctx = get_nfs_open_context(ctx);
6626         locks_init_lock(&p->fl);
6627         locks_copy_lock(&p->fl, fl);
6628         return p;
6629 out_free_seqid:
6630         nfs_free_seqid(p->arg.open_seqid);
6631 out_free:
6632         kfree(p);
6633         return NULL;
6634 }
6635
6636 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
6637 {
6638         struct nfs4_lockdata *data = calldata;
6639         struct nfs4_state *state = data->lsp->ls_state;
6640
6641         dprintk("%s: begin!\n", __func__);
6642         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
6643                 goto out_wait;
6644         /* Do we need to do an open_to_lock_owner? */
6645         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
6646                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
6647                         goto out_release_lock_seqid;
6648                 }
6649                 nfs4_stateid_copy(&data->arg.open_stateid,
6650                                 &state->open_stateid);
6651                 data->arg.new_lock_owner = 1;
6652                 data->res.open_seqid = data->arg.open_seqid;
6653         } else {
6654                 data->arg.new_lock_owner = 0;
6655                 nfs4_stateid_copy(&data->arg.lock_stateid,
6656                                 &data->lsp->ls_stateid);
6657         }
6658         if (!nfs4_valid_open_stateid(state)) {
6659                 data->rpc_status = -EBADF;
6660                 task->tk_action = NULL;
6661                 goto out_release_open_seqid;
6662         }
6663         data->timestamp = jiffies;
6664         if (nfs4_setup_sequence(data->server->nfs_client,
6665                                 &data->arg.seq_args,
6666                                 &data->res.seq_res,
6667                                 task) == 0)
6668                 return;
6669 out_release_open_seqid:
6670         nfs_release_seqid(data->arg.open_seqid);
6671 out_release_lock_seqid:
6672         nfs_release_seqid(data->arg.lock_seqid);
6673 out_wait:
6674         nfs4_sequence_done(task, &data->res.seq_res);
6675         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
6676 }
6677
6678 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
6679 {
6680         struct nfs4_lockdata *data = calldata;
6681         struct nfs4_lock_state *lsp = data->lsp;
6682
6683         dprintk("%s: begin!\n", __func__);
6684
6685         if (!nfs4_sequence_done(task, &data->res.seq_res))
6686                 return;
6687
6688         data->rpc_status = task->tk_status;
6689         switch (task->tk_status) {
6690         case 0:
6691                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
6692                                 data->timestamp);
6693                 if (data->arg.new_lock && !data->cancelled) {
6694                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
6695                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
6696                                 goto out_restart;
6697                 }
6698                 if (data->arg.new_lock_owner != 0) {
6699                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
6700                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
6701                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6702                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
6703                         goto out_restart;
6704                 break;
6705         case -NFS4ERR_BAD_STATEID:
6706         case -NFS4ERR_OLD_STATEID:
6707         case -NFS4ERR_STALE_STATEID:
6708         case -NFS4ERR_EXPIRED:
6709                 if (data->arg.new_lock_owner != 0) {
6710                         if (!nfs4_stateid_match(&data->arg.open_stateid,
6711                                                 &lsp->ls_state->open_stateid))
6712                                 goto out_restart;
6713                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
6714                                                 &lsp->ls_stateid))
6715                                 goto out_restart;
6716         }
6717 out_done:
6718         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
6719         return;
6720 out_restart:
6721         if (!data->cancelled)
6722                 rpc_restart_call_prepare(task);
6723         goto out_done;
6724 }
6725
6726 static void nfs4_lock_release(void *calldata)
6727 {
6728         struct nfs4_lockdata *data = calldata;
6729
6730         dprintk("%s: begin!\n", __func__);
6731         nfs_free_seqid(data->arg.open_seqid);
6732         if (data->cancelled && data->rpc_status == 0) {
6733                 struct rpc_task *task;
6734                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
6735                                 data->arg.lock_seqid);
6736                 if (!IS_ERR(task))
6737                         rpc_put_task_async(task);
6738                 dprintk("%s: cancelling lock!\n", __func__);
6739         } else
6740                 nfs_free_seqid(data->arg.lock_seqid);
6741         nfs4_put_lock_state(data->lsp);
6742         put_nfs_open_context(data->ctx);
6743         kfree(data);
6744         dprintk("%s: done!\n", __func__);
6745 }
6746
6747 static const struct rpc_call_ops nfs4_lock_ops = {
6748         .rpc_call_prepare = nfs4_lock_prepare,
6749         .rpc_call_done = nfs4_lock_done,
6750         .rpc_release = nfs4_lock_release,
6751 };
6752
6753 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
6754 {
6755         switch (error) {
6756         case -NFS4ERR_ADMIN_REVOKED:
6757         case -NFS4ERR_EXPIRED:
6758         case -NFS4ERR_BAD_STATEID:
6759                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6760                 if (new_lock_owner != 0 ||
6761                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
6762                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
6763                 break;
6764         case -NFS4ERR_STALE_STATEID:
6765                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6766                 nfs4_schedule_lease_recovery(server->nfs_client);
6767         };
6768 }
6769
6770 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
6771 {
6772         struct nfs4_lockdata *data;
6773         struct rpc_task *task;
6774         struct rpc_message msg = {
6775                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
6776                 .rpc_cred = state->owner->so_cred,
6777         };
6778         struct rpc_task_setup task_setup_data = {
6779                 .rpc_client = NFS_CLIENT(state->inode),
6780                 .rpc_message = &msg,
6781                 .callback_ops = &nfs4_lock_ops,
6782                 .workqueue = nfsiod_workqueue,
6783                 .flags = RPC_TASK_ASYNC,
6784         };
6785         int ret;
6786
6787         dprintk("%s: begin!\n", __func__);
6788         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
6789                         fl->fl_u.nfs4_fl.owner,
6790                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
6791         if (data == NULL)
6792                 return -ENOMEM;
6793         if (IS_SETLKW(cmd))
6794                 data->arg.block = 1;
6795         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
6796                                 recovery_type > NFS_LOCK_NEW);
6797         msg.rpc_argp = &data->arg;
6798         msg.rpc_resp = &data->res;
6799         task_setup_data.callback_data = data;
6800         if (recovery_type > NFS_LOCK_NEW) {
6801                 if (recovery_type == NFS_LOCK_RECLAIM)
6802                         data->arg.reclaim = NFS_LOCK_RECLAIM;
6803         } else
6804                 data->arg.new_lock = 1;
6805         task = rpc_run_task(&task_setup_data);
6806         if (IS_ERR(task))
6807                 return PTR_ERR(task);
6808         ret = rpc_wait_for_completion_task(task);
6809         if (ret == 0) {
6810                 ret = data->rpc_status;
6811                 if (ret)
6812                         nfs4_handle_setlk_error(data->server, data->lsp,
6813                                         data->arg.new_lock_owner, ret);
6814         } else
6815                 data->cancelled = true;
6816         rpc_put_task(task);
6817         dprintk("%s: done, ret = %d!\n", __func__, ret);
6818         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
6819         return ret;
6820 }
6821
6822 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
6823 {
6824         struct nfs_server *server = NFS_SERVER(state->inode);
6825         struct nfs4_exception exception = {
6826                 .inode = state->inode,
6827         };
6828         int err;
6829
6830         do {
6831                 /* Cache the lock if possible... */
6832                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6833                         return 0;
6834                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
6835                 if (err != -NFS4ERR_DELAY)
6836                         break;
6837                 nfs4_handle_exception(server, err, &exception);
6838         } while (exception.retry);
6839         return err;
6840 }
6841
6842 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
6843 {
6844         struct nfs_server *server = NFS_SERVER(state->inode);
6845         struct nfs4_exception exception = {
6846                 .inode = state->inode,
6847         };
6848         int err;
6849
6850         err = nfs4_set_lock_state(state, request);
6851         if (err != 0)
6852                 return err;
6853         if (!recover_lost_locks) {
6854                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
6855                 return 0;
6856         }
6857         do {
6858                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6859                         return 0;
6860                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
6861                 switch (err) {
6862                 default:
6863                         goto out;
6864                 case -NFS4ERR_GRACE:
6865                 case -NFS4ERR_DELAY:
6866                         nfs4_handle_exception(server, err, &exception);
6867                         err = 0;
6868                 }
6869         } while (exception.retry);
6870 out:
6871         return err;
6872 }
6873
6874 #if defined(CONFIG_NFS_V4_1)
6875 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6876 {
6877         struct nfs4_lock_state *lsp;
6878         int status;
6879
6880         status = nfs4_set_lock_state(state, request);
6881         if (status != 0)
6882                 return status;
6883         lsp = request->fl_u.nfs4_fl.owner;
6884         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
6885             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
6886                 return 0;
6887         return nfs4_lock_expired(state, request);
6888 }
6889 #endif
6890
6891 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6892 {
6893         struct nfs_inode *nfsi = NFS_I(state->inode);
6894         struct nfs4_state_owner *sp = state->owner;
6895         unsigned char fl_flags = request->fl_flags;
6896         int status;
6897
6898         request->fl_flags |= FL_ACCESS;
6899         status = locks_lock_inode_wait(state->inode, request);
6900         if (status < 0)
6901                 goto out;
6902         mutex_lock(&sp->so_delegreturn_mutex);
6903         down_read(&nfsi->rwsem);
6904         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6905                 /* Yes: cache locks! */
6906                 /* ...but avoid races with delegation recall... */
6907                 request->fl_flags = fl_flags & ~FL_SLEEP;
6908                 status = locks_lock_inode_wait(state->inode, request);
6909                 up_read(&nfsi->rwsem);
6910                 mutex_unlock(&sp->so_delegreturn_mutex);
6911                 goto out;
6912         }
6913         up_read(&nfsi->rwsem);
6914         mutex_unlock(&sp->so_delegreturn_mutex);
6915         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6916 out:
6917         request->fl_flags = fl_flags;
6918         return status;
6919 }
6920
6921 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6922 {
6923         struct nfs4_exception exception = {
6924                 .state = state,
6925                 .inode = state->inode,
6926                 .interruptible = true,
6927         };
6928         int err;
6929
6930         do {
6931                 err = _nfs4_proc_setlk(state, cmd, request);
6932                 if (err == -NFS4ERR_DENIED)
6933                         err = -EAGAIN;
6934                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6935                                 err, &exception);
6936         } while (exception.retry);
6937         return err;
6938 }
6939
6940 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
6941 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
6942
6943 static int
6944 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
6945                         struct file_lock *request)
6946 {
6947         int             status = -ERESTARTSYS;
6948         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
6949
6950         while(!signalled()) {
6951                 status = nfs4_proc_setlk(state, cmd, request);
6952                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6953                         break;
6954                 freezable_schedule_timeout_interruptible(timeout);
6955                 timeout *= 2;
6956                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
6957                 status = -ERESTARTSYS;
6958         }
6959         return status;
6960 }
6961
6962 #ifdef CONFIG_NFS_V4_1
6963 struct nfs4_lock_waiter {
6964         struct task_struct      *task;
6965         struct inode            *inode;
6966         struct nfs_lowner       *owner;
6967 };
6968
6969 static int
6970 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
6971 {
6972         int ret;
6973         struct nfs4_lock_waiter *waiter = wait->private;
6974
6975         /* NULL key means to wake up everyone */
6976         if (key) {
6977                 struct cb_notify_lock_args      *cbnl = key;
6978                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
6979                                                 *wowner = waiter->owner;
6980
6981                 /* Only wake if the callback was for the same owner. */
6982                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
6983                         return 0;
6984
6985                 /* Make sure it's for the right inode */
6986                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
6987                         return 0;
6988         }
6989
6990         /* override "private" so we can use default_wake_function */
6991         wait->private = waiter->task;
6992         ret = woken_wake_function(wait, mode, flags, key);
6993         if (ret)
6994                 list_del_init(&wait->entry);
6995         wait->private = waiter;
6996         return ret;
6997 }
6998
6999 static int
7000 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7001 {
7002         int status = -ERESTARTSYS;
7003         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7004         struct nfs_server *server = NFS_SERVER(state->inode);
7005         struct nfs_client *clp = server->nfs_client;
7006         wait_queue_head_t *q = &clp->cl_lock_waitq;
7007         struct nfs_lowner owner = { .clientid = clp->cl_clientid,
7008                                     .id = lsp->ls_seqid.owner_id,
7009                                     .s_dev = server->s_dev };
7010         struct nfs4_lock_waiter waiter = { .task  = current,
7011                                            .inode = state->inode,
7012                                            .owner = &owner};
7013         wait_queue_entry_t wait;
7014
7015         /* Don't bother with waitqueue if we don't expect a callback */
7016         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7017                 return nfs4_retry_setlk_simple(state, cmd, request);
7018
7019         init_wait(&wait);
7020         wait.private = &waiter;
7021         wait.func = nfs4_wake_lock_waiter;
7022
7023         while(!signalled()) {
7024                 add_wait_queue(q, &wait);
7025                 status = nfs4_proc_setlk(state, cmd, request);
7026                 if ((status != -EAGAIN) || IS_SETLK(cmd)) {
7027                         finish_wait(q, &wait);
7028                         break;
7029                 }
7030
7031                 status = -ERESTARTSYS;
7032                 freezer_do_not_count();
7033                 wait_woken(&wait, TASK_INTERRUPTIBLE, NFS4_LOCK_MAXTIMEOUT);
7034                 freezer_count();
7035                 finish_wait(q, &wait);
7036         }
7037
7038         return status;
7039 }
7040 #else /* !CONFIG_NFS_V4_1 */
7041 static inline int
7042 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7043 {
7044         return nfs4_retry_setlk_simple(state, cmd, request);
7045 }
7046 #endif
7047
7048 static int
7049 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7050 {
7051         struct nfs_open_context *ctx;
7052         struct nfs4_state *state;
7053         int status;
7054
7055         /* verify open state */
7056         ctx = nfs_file_open_context(filp);
7057         state = ctx->state;
7058
7059         if (IS_GETLK(cmd)) {
7060                 if (state != NULL)
7061                         return nfs4_proc_getlk(state, F_GETLK, request);
7062                 return 0;
7063         }
7064
7065         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7066                 return -EINVAL;
7067
7068         if (request->fl_type == F_UNLCK) {
7069                 if (state != NULL)
7070                         return nfs4_proc_unlck(state, cmd, request);
7071                 return 0;
7072         }
7073
7074         if (state == NULL)
7075                 return -ENOLCK;
7076
7077         if ((request->fl_flags & FL_POSIX) &&
7078             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7079                 return -ENOLCK;
7080
7081         /*
7082          * Don't rely on the VFS having checked the file open mode,
7083          * since it won't do this for flock() locks.
7084          */
7085         switch (request->fl_type) {
7086         case F_RDLCK:
7087                 if (!(filp->f_mode & FMODE_READ))
7088                         return -EBADF;
7089                 break;
7090         case F_WRLCK:
7091                 if (!(filp->f_mode & FMODE_WRITE))
7092                         return -EBADF;
7093         }
7094
7095         status = nfs4_set_lock_state(state, request);
7096         if (status != 0)
7097                 return status;
7098
7099         return nfs4_retry_setlk(state, cmd, request);
7100 }
7101
7102 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7103 {
7104         struct nfs_server *server = NFS_SERVER(state->inode);
7105         int err;
7106
7107         err = nfs4_set_lock_state(state, fl);
7108         if (err != 0)
7109                 return err;
7110         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7111         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7112 }
7113
7114 struct nfs_release_lockowner_data {
7115         struct nfs4_lock_state *lsp;
7116         struct nfs_server *server;
7117         struct nfs_release_lockowner_args args;
7118         struct nfs_release_lockowner_res res;
7119         unsigned long timestamp;
7120 };
7121
7122 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7123 {
7124         struct nfs_release_lockowner_data *data = calldata;
7125         struct nfs_server *server = data->server;
7126         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7127                            &data->res.seq_res, task);
7128         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7129         data->timestamp = jiffies;
7130 }
7131
7132 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7133 {
7134         struct nfs_release_lockowner_data *data = calldata;
7135         struct nfs_server *server = data->server;
7136
7137         nfs40_sequence_done(task, &data->res.seq_res);
7138
7139         switch (task->tk_status) {
7140         case 0:
7141                 renew_lease(server, data->timestamp);
7142                 break;
7143         case -NFS4ERR_STALE_CLIENTID:
7144         case -NFS4ERR_EXPIRED:
7145                 nfs4_schedule_lease_recovery(server->nfs_client);
7146                 break;
7147         case -NFS4ERR_LEASE_MOVED:
7148         case -NFS4ERR_DELAY:
7149                 if (nfs4_async_handle_error(task, server,
7150                                             NULL, NULL) == -EAGAIN)
7151                         rpc_restart_call_prepare(task);
7152         }
7153 }
7154
7155 static void nfs4_release_lockowner_release(void *calldata)
7156 {
7157         struct nfs_release_lockowner_data *data = calldata;
7158         nfs4_free_lock_state(data->server, data->lsp);
7159         kfree(calldata);
7160 }
7161
7162 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7163         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7164         .rpc_call_done = nfs4_release_lockowner_done,
7165         .rpc_release = nfs4_release_lockowner_release,
7166 };
7167
7168 static void
7169 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7170 {
7171         struct nfs_release_lockowner_data *data;
7172         struct rpc_message msg = {
7173                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7174         };
7175
7176         if (server->nfs_client->cl_mvops->minor_version != 0)
7177                 return;
7178
7179         data = kmalloc(sizeof(*data), GFP_NOFS);
7180         if (!data)
7181                 return;
7182         data->lsp = lsp;
7183         data->server = server;
7184         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7185         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7186         data->args.lock_owner.s_dev = server->s_dev;
7187
7188         msg.rpc_argp = &data->args;
7189         msg.rpc_resp = &data->res;
7190         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7191         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7192 }
7193
7194 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7195
7196 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7197                                    struct dentry *unused, struct inode *inode,
7198                                    const char *key, const void *buf,
7199                                    size_t buflen, int flags)
7200 {
7201         return nfs4_proc_set_acl(inode, buf, buflen);
7202 }
7203
7204 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7205                                    struct dentry *unused, struct inode *inode,
7206                                    const char *key, void *buf, size_t buflen)
7207 {
7208         return nfs4_proc_get_acl(inode, buf, buflen);
7209 }
7210
7211 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7212 {
7213         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
7214 }
7215
7216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7217
7218 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7219                                      struct dentry *unused, struct inode *inode,
7220                                      const char *key, const void *buf,
7221                                      size_t buflen, int flags)
7222 {
7223         if (security_ismaclabel(key))
7224                 return nfs4_set_security_label(inode, buf, buflen);
7225
7226         return -EOPNOTSUPP;
7227 }
7228
7229 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7230                                      struct dentry *unused, struct inode *inode,
7231                                      const char *key, void *buf, size_t buflen)
7232 {
7233         if (security_ismaclabel(key))
7234                 return nfs4_get_security_label(inode, buf, buflen);
7235         return -EOPNOTSUPP;
7236 }
7237
7238 static ssize_t
7239 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7240 {
7241         int len = 0;
7242
7243         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7244                 len = security_inode_listsecurity(inode, list, list_len);
7245                 if (list_len && len > list_len)
7246                         return -ERANGE;
7247         }
7248         return len;
7249 }
7250
7251 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7252         .prefix = XATTR_SECURITY_PREFIX,
7253         .get    = nfs4_xattr_get_nfs4_label,
7254         .set    = nfs4_xattr_set_nfs4_label,
7255 };
7256
7257 #else
7258
7259 static ssize_t
7260 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7261 {
7262         return 0;
7263 }
7264
7265 #endif
7266
7267 /*
7268  * nfs_fhget will use either the mounted_on_fileid or the fileid
7269  */
7270 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7271 {
7272         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7273                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7274               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7275               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7276                 return;
7277
7278         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7279                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7280         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7281         fattr->nlink = 2;
7282 }
7283
7284 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7285                                    const struct qstr *name,
7286                                    struct nfs4_fs_locations *fs_locations,
7287                                    struct page *page)
7288 {
7289         struct nfs_server *server = NFS_SERVER(dir);
7290         u32 bitmask[3];
7291         struct nfs4_fs_locations_arg args = {
7292                 .dir_fh = NFS_FH(dir),
7293                 .name = name,
7294                 .page = page,
7295                 .bitmask = bitmask,
7296         };
7297         struct nfs4_fs_locations_res res = {
7298                 .fs_locations = fs_locations,
7299         };
7300         struct rpc_message msg = {
7301                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7302                 .rpc_argp = &args,
7303                 .rpc_resp = &res,
7304         };
7305         int status;
7306
7307         dprintk("%s: start\n", __func__);
7308
7309         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7310         bitmask[1] = nfs4_fattr_bitmap[1];
7311
7312         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7313          * is not supported */
7314         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7315                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
7316         else
7317                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
7318
7319         nfs_fattr_init(&fs_locations->fattr);
7320         fs_locations->server = server;
7321         fs_locations->nlocations = 0;
7322         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
7323         dprintk("%s: returned status = %d\n", __func__, status);
7324         return status;
7325 }
7326
7327 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7328                            const struct qstr *name,
7329                            struct nfs4_fs_locations *fs_locations,
7330                            struct page *page)
7331 {
7332         struct nfs4_exception exception = {
7333                 .interruptible = true,
7334         };
7335         int err;
7336         do {
7337                 err = _nfs4_proc_fs_locations(client, dir, name,
7338                                 fs_locations, page);
7339                 trace_nfs4_get_fs_locations(dir, name, err);
7340                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7341                                 &exception);
7342         } while (exception.retry);
7343         return err;
7344 }
7345
7346 /*
7347  * This operation also signals the server that this client is
7348  * performing migration recovery.  The server can stop returning
7349  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
7350  * appended to this compound to identify the client ID which is
7351  * performing recovery.
7352  */
7353 static int _nfs40_proc_get_locations(struct inode *inode,
7354                                      struct nfs4_fs_locations *locations,
7355                                      struct page *page, const struct cred *cred)
7356 {
7357         struct nfs_server *server = NFS_SERVER(inode);
7358         struct rpc_clnt *clnt = server->client;
7359         u32 bitmask[2] = {
7360                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7361         };
7362         struct nfs4_fs_locations_arg args = {
7363                 .clientid       = server->nfs_client->cl_clientid,
7364                 .fh             = NFS_FH(inode),
7365                 .page           = page,
7366                 .bitmask        = bitmask,
7367                 .migration      = 1,            /* skip LOOKUP */
7368                 .renew          = 1,            /* append RENEW */
7369         };
7370         struct nfs4_fs_locations_res res = {
7371                 .fs_locations   = locations,
7372                 .migration      = 1,
7373                 .renew          = 1,
7374         };
7375         struct rpc_message msg = {
7376                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7377                 .rpc_argp       = &args,
7378                 .rpc_resp       = &res,
7379                 .rpc_cred       = cred,
7380         };
7381         unsigned long now = jiffies;
7382         int status;
7383
7384         nfs_fattr_init(&locations->fattr);
7385         locations->server = server;
7386         locations->nlocations = 0;
7387
7388         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7389         status = nfs4_call_sync_sequence(clnt, server, &msg,
7390                                         &args.seq_args, &res.seq_res);
7391         if (status)
7392                 return status;
7393
7394         renew_lease(server, now);
7395         return 0;
7396 }
7397
7398 #ifdef CONFIG_NFS_V4_1
7399
7400 /*
7401  * This operation also signals the server that this client is
7402  * performing migration recovery.  The server can stop asserting
7403  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
7404  * performing this operation is identified in the SEQUENCE
7405  * operation in this compound.
7406  *
7407  * When the client supports GETATTR(fs_locations_info), it can
7408  * be plumbed in here.
7409  */
7410 static int _nfs41_proc_get_locations(struct inode *inode,
7411                                      struct nfs4_fs_locations *locations,
7412                                      struct page *page, const struct cred *cred)
7413 {
7414         struct nfs_server *server = NFS_SERVER(inode);
7415         struct rpc_clnt *clnt = server->client;
7416         u32 bitmask[2] = {
7417                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7418         };
7419         struct nfs4_fs_locations_arg args = {
7420                 .fh             = NFS_FH(inode),
7421                 .page           = page,
7422                 .bitmask        = bitmask,
7423                 .migration      = 1,            /* skip LOOKUP */
7424         };
7425         struct nfs4_fs_locations_res res = {
7426                 .fs_locations   = locations,
7427                 .migration      = 1,
7428         };
7429         struct rpc_message msg = {
7430                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7431                 .rpc_argp       = &args,
7432                 .rpc_resp       = &res,
7433                 .rpc_cred       = cred,
7434         };
7435         int status;
7436
7437         nfs_fattr_init(&locations->fattr);
7438         locations->server = server;
7439         locations->nlocations = 0;
7440
7441         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7442         status = nfs4_call_sync_sequence(clnt, server, &msg,
7443                                         &args.seq_args, &res.seq_res);
7444         if (status == NFS4_OK &&
7445             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7446                 status = -NFS4ERR_LEASE_MOVED;
7447         return status;
7448 }
7449
7450 #endif  /* CONFIG_NFS_V4_1 */
7451
7452 /**
7453  * nfs4_proc_get_locations - discover locations for a migrated FSID
7454  * @inode: inode on FSID that is migrating
7455  * @locations: result of query
7456  * @page: buffer
7457  * @cred: credential to use for this operation
7458  *
7459  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
7460  * operation failed, or a negative errno if a local error occurred.
7461  *
7462  * On success, "locations" is filled in, but if the server has
7463  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
7464  * asserted.
7465  *
7466  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
7467  * from this client that require migration recovery.
7468  */
7469 int nfs4_proc_get_locations(struct inode *inode,
7470                             struct nfs4_fs_locations *locations,
7471                             struct page *page, const struct cred *cred)
7472 {
7473         struct nfs_server *server = NFS_SERVER(inode);
7474         struct nfs_client *clp = server->nfs_client;
7475         const struct nfs4_mig_recovery_ops *ops =
7476                                         clp->cl_mvops->mig_recovery_ops;
7477         struct nfs4_exception exception = {
7478                 .interruptible = true,
7479         };
7480         int status;
7481
7482         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7483                 (unsigned long long)server->fsid.major,
7484                 (unsigned long long)server->fsid.minor,
7485                 clp->cl_hostname);
7486         nfs_display_fhandle(NFS_FH(inode), __func__);
7487
7488         do {
7489                 status = ops->get_locations(inode, locations, page, cred);
7490                 if (status != -NFS4ERR_DELAY)
7491                         break;
7492                 nfs4_handle_exception(server, status, &exception);
7493         } while (exception.retry);
7494         return status;
7495 }
7496
7497 /*
7498  * This operation also signals the server that this client is
7499  * performing "lease moved" recovery.  The server can stop
7500  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
7501  * is appended to this compound to identify the client ID which is
7502  * performing recovery.
7503  */
7504 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
7505 {
7506         struct nfs_server *server = NFS_SERVER(inode);
7507         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
7508         struct rpc_clnt *clnt = server->client;
7509         struct nfs4_fsid_present_arg args = {
7510                 .fh             = NFS_FH(inode),
7511                 .clientid       = clp->cl_clientid,
7512                 .renew          = 1,            /* append RENEW */
7513         };
7514         struct nfs4_fsid_present_res res = {
7515                 .renew          = 1,
7516         };
7517         struct rpc_message msg = {
7518                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7519                 .rpc_argp       = &args,
7520                 .rpc_resp       = &res,
7521                 .rpc_cred       = cred,
7522         };
7523         unsigned long now = jiffies;
7524         int status;
7525
7526         res.fh = nfs_alloc_fhandle();
7527         if (res.fh == NULL)
7528                 return -ENOMEM;
7529
7530         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7531         status = nfs4_call_sync_sequence(clnt, server, &msg,
7532                                                 &args.seq_args, &res.seq_res);
7533         nfs_free_fhandle(res.fh);
7534         if (status)
7535                 return status;
7536
7537         do_renew_lease(clp, now);
7538         return 0;
7539 }
7540
7541 #ifdef CONFIG_NFS_V4_1
7542
7543 /*
7544  * This operation also signals the server that this client is
7545  * performing "lease moved" recovery.  The server can stop asserting
7546  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
7547  * this operation is identified in the SEQUENCE operation in this
7548  * compound.
7549  */
7550 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
7551 {
7552         struct nfs_server *server = NFS_SERVER(inode);
7553         struct rpc_clnt *clnt = server->client;
7554         struct nfs4_fsid_present_arg args = {
7555                 .fh             = NFS_FH(inode),
7556         };
7557         struct nfs4_fsid_present_res res = {
7558         };
7559         struct rpc_message msg = {
7560                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7561                 .rpc_argp       = &args,
7562                 .rpc_resp       = &res,
7563                 .rpc_cred       = cred,
7564         };
7565         int status;
7566
7567         res.fh = nfs_alloc_fhandle();
7568         if (res.fh == NULL)
7569                 return -ENOMEM;
7570
7571         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7572         status = nfs4_call_sync_sequence(clnt, server, &msg,
7573                                                 &args.seq_args, &res.seq_res);
7574         nfs_free_fhandle(res.fh);
7575         if (status == NFS4_OK &&
7576             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7577                 status = -NFS4ERR_LEASE_MOVED;
7578         return status;
7579 }
7580
7581 #endif  /* CONFIG_NFS_V4_1 */
7582
7583 /**
7584  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
7585  * @inode: inode on FSID to check
7586  * @cred: credential to use for this operation
7587  *
7588  * Server indicates whether the FSID is present, moved, or not
7589  * recognized.  This operation is necessary to clear a LEASE_MOVED
7590  * condition for this client ID.
7591  *
7592  * Returns NFS4_OK if the FSID is present on this server,
7593  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
7594  *  NFS4ERR code if some error occurred on the server, or a
7595  *  negative errno if a local failure occurred.
7596  */
7597 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
7598 {
7599         struct nfs_server *server = NFS_SERVER(inode);
7600         struct nfs_client *clp = server->nfs_client;
7601         const struct nfs4_mig_recovery_ops *ops =
7602                                         clp->cl_mvops->mig_recovery_ops;
7603         struct nfs4_exception exception = {
7604                 .interruptible = true,
7605         };
7606         int status;
7607
7608         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7609                 (unsigned long long)server->fsid.major,
7610                 (unsigned long long)server->fsid.minor,
7611                 clp->cl_hostname);
7612         nfs_display_fhandle(NFS_FH(inode), __func__);
7613
7614         do {
7615                 status = ops->fsid_present(inode, cred);
7616                 if (status != -NFS4ERR_DELAY)
7617                         break;
7618                 nfs4_handle_exception(server, status, &exception);
7619         } while (exception.retry);
7620         return status;
7621 }
7622
7623 /*
7624  * If 'use_integrity' is true and the state managment nfs_client
7625  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
7626  * and the machine credential as per RFC3530bis and RFC5661 Security
7627  * Considerations sections. Otherwise, just use the user cred with the
7628  * filesystem's rpc_client.
7629  */
7630 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7631 {
7632         int status;
7633         struct nfs4_secinfo_arg args = {
7634                 .dir_fh = NFS_FH(dir),
7635                 .name   = name,
7636         };
7637         struct nfs4_secinfo_res res = {
7638                 .flavors     = flavors,
7639         };
7640         struct rpc_message msg = {
7641                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
7642                 .rpc_argp = &args,
7643                 .rpc_resp = &res,
7644         };
7645         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
7646         const struct cred *cred = NULL;
7647
7648         if (use_integrity) {
7649                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
7650                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
7651                 msg.rpc_cred = cred;
7652         }
7653
7654         dprintk("NFS call  secinfo %s\n", name->name);
7655
7656         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
7657                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
7658
7659         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
7660                                 &res.seq_res, RPC_TASK_NO_ROUND_ROBIN);
7661         dprintk("NFS reply  secinfo: %d\n", status);
7662
7663         put_cred(cred);
7664
7665         return status;
7666 }
7667
7668 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
7669                       struct nfs4_secinfo_flavors *flavors)
7670 {
7671         struct nfs4_exception exception = {
7672                 .interruptible = true,
7673         };
7674         int err;
7675         do {
7676                 err = -NFS4ERR_WRONGSEC;
7677
7678                 /* try to use integrity protection with machine cred */
7679                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
7680                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
7681
7682                 /*
7683                  * if unable to use integrity protection, or SECINFO with
7684                  * integrity protection returns NFS4ERR_WRONGSEC (which is
7685                  * disallowed by spec, but exists in deployed servers) use
7686                  * the current filesystem's rpc_client and the user cred.
7687                  */
7688                 if (err == -NFS4ERR_WRONGSEC)
7689                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
7690
7691                 trace_nfs4_secinfo(dir, name, err);
7692                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7693                                 &exception);
7694         } while (exception.retry);
7695         return err;
7696 }
7697
7698 #ifdef CONFIG_NFS_V4_1
7699 /*
7700  * Check the exchange flags returned by the server for invalid flags, having
7701  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
7702  * DS flags set.
7703  */
7704 static int nfs4_check_cl_exchange_flags(u32 flags)
7705 {
7706         if (flags & ~EXCHGID4_FLAG_MASK_R)
7707                 goto out_inval;
7708         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
7709             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
7710                 goto out_inval;
7711         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
7712                 goto out_inval;
7713         return NFS_OK;
7714 out_inval:
7715         return -NFS4ERR_INVAL;
7716 }
7717
7718 static bool
7719 nfs41_same_server_scope(struct nfs41_server_scope *a,
7720                         struct nfs41_server_scope *b)
7721 {
7722         if (a->server_scope_sz != b->server_scope_sz)
7723                 return false;
7724         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
7725 }
7726
7727 static void
7728 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
7729 {
7730 }
7731
7732 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
7733         .rpc_call_done =  &nfs4_bind_one_conn_to_session_done,
7734 };
7735
7736 /*
7737  * nfs4_proc_bind_one_conn_to_session()
7738  *
7739  * The 4.1 client currently uses the same TCP connection for the
7740  * fore and backchannel.
7741  */
7742 static
7743 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
7744                 struct rpc_xprt *xprt,
7745                 struct nfs_client *clp,
7746                 const struct cred *cred)
7747 {
7748         int status;
7749         struct nfs41_bind_conn_to_session_args args = {
7750                 .client = clp,
7751                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
7752         };
7753         struct nfs41_bind_conn_to_session_res res;
7754         struct rpc_message msg = {
7755                 .rpc_proc =
7756                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
7757                 .rpc_argp = &args,
7758                 .rpc_resp = &res,
7759                 .rpc_cred = cred,
7760         };
7761         struct rpc_task_setup task_setup_data = {
7762                 .rpc_client = clnt,
7763                 .rpc_xprt = xprt,
7764                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
7765                 .rpc_message = &msg,
7766                 .flags = RPC_TASK_TIMEOUT,
7767         };
7768         struct rpc_task *task;
7769
7770         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
7771         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
7772                 args.dir = NFS4_CDFC4_FORE;
7773
7774         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
7775         if (xprt != rcu_access_pointer(clnt->cl_xprt))
7776                 args.dir = NFS4_CDFC4_FORE;
7777
7778         task = rpc_run_task(&task_setup_data);
7779         if (!IS_ERR(task)) {
7780                 status = task->tk_status;
7781                 rpc_put_task(task);
7782         } else
7783                 status = PTR_ERR(task);
7784         trace_nfs4_bind_conn_to_session(clp, status);
7785         if (status == 0) {
7786                 if (memcmp(res.sessionid.data,
7787                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
7788                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
7789                         return -EIO;
7790                 }
7791                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
7792                         dprintk("NFS: %s: Unexpected direction from server\n",
7793                                 __func__);
7794                         return -EIO;
7795                 }
7796                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
7797                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
7798                                 __func__);
7799                         return -EIO;
7800                 }
7801         }
7802
7803         return status;
7804 }
7805
7806 struct rpc_bind_conn_calldata {
7807         struct nfs_client *clp;
7808         const struct cred *cred;
7809 };
7810
7811 static int
7812 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
7813                 struct rpc_xprt *xprt,
7814                 void *calldata)
7815 {
7816         struct rpc_bind_conn_calldata *p = calldata;
7817
7818         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
7819 }
7820
7821 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
7822 {
7823         struct rpc_bind_conn_calldata data = {
7824                 .clp = clp,
7825                 .cred = cred,
7826         };
7827         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
7828                         nfs4_proc_bind_conn_to_session_callback, &data);
7829 }
7830
7831 /*
7832  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
7833  * and operations we'd like to see to enable certain features in the allow map
7834  */
7835 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
7836         .how = SP4_MACH_CRED,
7837         .enforce.u.words = {
7838                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7839                       1 << (OP_EXCHANGE_ID - 32) |
7840                       1 << (OP_CREATE_SESSION - 32) |
7841                       1 << (OP_DESTROY_SESSION - 32) |
7842                       1 << (OP_DESTROY_CLIENTID - 32)
7843         },
7844         .allow.u.words = {
7845                 [0] = 1 << (OP_CLOSE) |
7846                       1 << (OP_OPEN_DOWNGRADE) |
7847                       1 << (OP_LOCKU) |
7848                       1 << (OP_DELEGRETURN) |
7849                       1 << (OP_COMMIT),
7850                 [1] = 1 << (OP_SECINFO - 32) |
7851                       1 << (OP_SECINFO_NO_NAME - 32) |
7852                       1 << (OP_LAYOUTRETURN - 32) |
7853                       1 << (OP_TEST_STATEID - 32) |
7854                       1 << (OP_FREE_STATEID - 32) |
7855                       1 << (OP_WRITE - 32)
7856         }
7857 };
7858
7859 /*
7860  * Select the state protection mode for client `clp' given the server results
7861  * from exchange_id in `sp'.
7862  *
7863  * Returns 0 on success, negative errno otherwise.
7864  */
7865 static int nfs4_sp4_select_mode(struct nfs_client *clp,
7866                                  struct nfs41_state_protection *sp)
7867 {
7868         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
7869                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7870                       1 << (OP_EXCHANGE_ID - 32) |
7871                       1 << (OP_CREATE_SESSION - 32) |
7872                       1 << (OP_DESTROY_SESSION - 32) |
7873                       1 << (OP_DESTROY_CLIENTID - 32)
7874         };
7875         unsigned long flags = 0;
7876         unsigned int i;
7877         int ret = 0;
7878
7879         if (sp->how == SP4_MACH_CRED) {
7880                 /* Print state protect result */
7881                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
7882                 for (i = 0; i <= LAST_NFS4_OP; i++) {
7883                         if (test_bit(i, sp->enforce.u.longs))
7884                                 dfprintk(MOUNT, "  enforce op %d\n", i);
7885                         if (test_bit(i, sp->allow.u.longs))
7886                                 dfprintk(MOUNT, "  allow op %d\n", i);
7887                 }
7888
7889                 /* make sure nothing is on enforce list that isn't supported */
7890                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
7891                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
7892                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7893                                 ret = -EINVAL;
7894                                 goto out;
7895                         }
7896                 }
7897
7898                 /*
7899                  * Minimal mode - state operations are allowed to use machine
7900                  * credential.  Note this already happens by default, so the
7901                  * client doesn't have to do anything more than the negotiation.
7902                  *
7903                  * NOTE: we don't care if EXCHANGE_ID is in the list -
7904                  *       we're already using the machine cred for exchange_id
7905                  *       and will never use a different cred.
7906                  */
7907                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
7908                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
7909                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
7910                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
7911                         dfprintk(MOUNT, "sp4_mach_cred:\n");
7912                         dfprintk(MOUNT, "  minimal mode enabled\n");
7913                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
7914                 } else {
7915                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7916                         ret = -EINVAL;
7917                         goto out;
7918                 }
7919
7920                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
7921                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
7922                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
7923                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
7924                         dfprintk(MOUNT, "  cleanup mode enabled\n");
7925                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
7926                 }
7927
7928                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
7929                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
7930                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
7931                 }
7932
7933                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
7934                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
7935                         dfprintk(MOUNT, "  secinfo mode enabled\n");
7936                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
7937                 }
7938
7939                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
7940                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
7941                         dfprintk(MOUNT, "  stateid mode enabled\n");
7942                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
7943                 }
7944
7945                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
7946                         dfprintk(MOUNT, "  write mode enabled\n");
7947                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
7948                 }
7949
7950                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
7951                         dfprintk(MOUNT, "  commit mode enabled\n");
7952                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
7953                 }
7954         }
7955 out:
7956         clp->cl_sp4_flags = flags;
7957         return ret;
7958 }
7959
7960 struct nfs41_exchange_id_data {
7961         struct nfs41_exchange_id_res res;
7962         struct nfs41_exchange_id_args args;
7963 };
7964
7965 static void nfs4_exchange_id_release(void *data)
7966 {
7967         struct nfs41_exchange_id_data *cdata =
7968                                         (struct nfs41_exchange_id_data *)data;
7969
7970         nfs_put_client(cdata->args.client);
7971         kfree(cdata->res.impl_id);
7972         kfree(cdata->res.server_scope);
7973         kfree(cdata->res.server_owner);
7974         kfree(cdata);
7975 }
7976
7977 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
7978         .rpc_release = nfs4_exchange_id_release,
7979 };
7980
7981 /*
7982  * _nfs4_proc_exchange_id()
7983  *
7984  * Wrapper for EXCHANGE_ID operation.
7985  */
7986 static struct rpc_task *
7987 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
7988                         u32 sp4_how, struct rpc_xprt *xprt)
7989 {
7990         struct rpc_message msg = {
7991                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
7992                 .rpc_cred = cred,
7993         };
7994         struct rpc_task_setup task_setup_data = {
7995                 .rpc_client = clp->cl_rpcclient,
7996                 .callback_ops = &nfs4_exchange_id_call_ops,
7997                 .rpc_message = &msg,
7998                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
7999         };
8000         struct nfs41_exchange_id_data *calldata;
8001         int status;
8002
8003         if (!refcount_inc_not_zero(&clp->cl_count))
8004                 return ERR_PTR(-EIO);
8005
8006         status = -ENOMEM;
8007         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8008         if (!calldata)
8009                 goto out;
8010
8011         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8012
8013         status = nfs4_init_uniform_client_string(clp);
8014         if (status)
8015                 goto out_calldata;
8016
8017         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8018                                                 GFP_NOFS);
8019         status = -ENOMEM;
8020         if (unlikely(calldata->res.server_owner == NULL))
8021                 goto out_calldata;
8022
8023         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8024                                         GFP_NOFS);
8025         if (unlikely(calldata->res.server_scope == NULL))
8026                 goto out_server_owner;
8027
8028         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8029         if (unlikely(calldata->res.impl_id == NULL))
8030                 goto out_server_scope;
8031
8032         switch (sp4_how) {
8033         case SP4_NONE:
8034                 calldata->args.state_protect.how = SP4_NONE;
8035                 break;
8036
8037         case SP4_MACH_CRED:
8038                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8039                 break;
8040
8041         default:
8042                 /* unsupported! */
8043                 WARN_ON_ONCE(1);
8044                 status = -EINVAL;
8045                 goto out_impl_id;
8046         }
8047         if (xprt) {
8048                 task_setup_data.rpc_xprt = xprt;
8049                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8050                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8051                                 sizeof(calldata->args.verifier.data));
8052         }
8053         calldata->args.client = clp;
8054         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8055         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8056 #ifdef CONFIG_NFS_V4_1_MIGRATION
8057         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8058 #endif
8059         msg.rpc_argp = &calldata->args;
8060         msg.rpc_resp = &calldata->res;
8061         task_setup_data.callback_data = calldata;
8062
8063         return rpc_run_task(&task_setup_data);
8064
8065 out_impl_id:
8066         kfree(calldata->res.impl_id);
8067 out_server_scope:
8068         kfree(calldata->res.server_scope);
8069 out_server_owner:
8070         kfree(calldata->res.server_owner);
8071 out_calldata:
8072         kfree(calldata);
8073 out:
8074         nfs_put_client(clp);
8075         return ERR_PTR(status);
8076 }
8077
8078 /*
8079  * _nfs4_proc_exchange_id()
8080  *
8081  * Wrapper for EXCHANGE_ID operation.
8082  */
8083 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8084                         u32 sp4_how)
8085 {
8086         struct rpc_task *task;
8087         struct nfs41_exchange_id_args *argp;
8088         struct nfs41_exchange_id_res *resp;
8089         int status;
8090
8091         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8092         if (IS_ERR(task))
8093                 return PTR_ERR(task);
8094
8095         argp = task->tk_msg.rpc_argp;
8096         resp = task->tk_msg.rpc_resp;
8097         status = task->tk_status;
8098         if (status  != 0)
8099                 goto out;
8100
8101         status = nfs4_check_cl_exchange_flags(resp->flags);
8102         if (status  != 0)
8103                 goto out;
8104
8105         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8106         if (status != 0)
8107                 goto out;
8108
8109         clp->cl_clientid = resp->clientid;
8110         clp->cl_exchange_flags = resp->flags;
8111         clp->cl_seqid = resp->seqid;
8112         /* Client ID is not confirmed */
8113         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8114                 clear_bit(NFS4_SESSION_ESTABLISHED,
8115                           &clp->cl_session->session_state);
8116
8117         if (clp->cl_serverscope != NULL &&
8118             !nfs41_same_server_scope(clp->cl_serverscope,
8119                                 resp->server_scope)) {
8120                 dprintk("%s: server_scope mismatch detected\n",
8121                         __func__);
8122                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8123         }
8124
8125         swap(clp->cl_serverowner, resp->server_owner);
8126         swap(clp->cl_serverscope, resp->server_scope);
8127         swap(clp->cl_implid, resp->impl_id);
8128
8129         /* Save the EXCHANGE_ID verifier session trunk tests */
8130         memcpy(clp->cl_confirm.data, argp->verifier.data,
8131                sizeof(clp->cl_confirm.data));
8132 out:
8133         trace_nfs4_exchange_id(clp, status);
8134         rpc_put_task(task);
8135         return status;
8136 }
8137
8138 /*
8139  * nfs4_proc_exchange_id()
8140  *
8141  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8142  *
8143  * Since the clientid has expired, all compounds using sessions
8144  * associated with the stale clientid will be returning
8145  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8146  * be in some phase of session reset.
8147  *
8148  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8149  */
8150 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8151 {
8152         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8153         int status;
8154
8155         /* try SP4_MACH_CRED if krb5i/p */
8156         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8157             authflavor == RPC_AUTH_GSS_KRB5P) {
8158                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8159                 if (!status)
8160                         return 0;
8161         }
8162
8163         /* try SP4_NONE */
8164         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8165 }
8166
8167 /**
8168  * nfs4_test_session_trunk
8169  *
8170  * This is an add_xprt_test() test function called from
8171  * rpc_clnt_setup_test_and_add_xprt.
8172  *
8173  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8174  * and is dereferrenced in nfs4_exchange_id_release
8175  *
8176  * Upon success, add the new transport to the rpc_clnt
8177  *
8178  * @clnt: struct rpc_clnt to get new transport
8179  * @xprt: the rpc_xprt to test
8180  * @data: call data for _nfs4_proc_exchange_id.
8181  */
8182 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8183                             void *data)
8184 {
8185         struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
8186         struct rpc_task *task;
8187         int status;
8188
8189         u32 sp4_how;
8190
8191         dprintk("--> %s try %s\n", __func__,
8192                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8193
8194         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8195
8196         /* Test connection for session trunking. Async exchange_id call */
8197         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8198         if (IS_ERR(task))
8199                 return;
8200
8201         status = task->tk_status;
8202         if (status == 0)
8203                 status = nfs4_detect_session_trunking(adata->clp,
8204                                 task->tk_msg.rpc_resp, xprt);
8205
8206         if (status == 0)
8207                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8208
8209         rpc_put_task(task);
8210 }
8211 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8212
8213 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8214                 const struct cred *cred)
8215 {
8216         struct rpc_message msg = {
8217                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8218                 .rpc_argp = clp,
8219                 .rpc_cred = cred,
8220         };
8221         int status;
8222
8223         status = rpc_call_sync(clp->cl_rpcclient, &msg,
8224                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8225         trace_nfs4_destroy_clientid(clp, status);
8226         if (status)
8227                 dprintk("NFS: Got error %d from the server %s on "
8228                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
8229         return status;
8230 }
8231
8232 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8233                 const struct cred *cred)
8234 {
8235         unsigned int loop;
8236         int ret;
8237
8238         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8239                 ret = _nfs4_proc_destroy_clientid(clp, cred);
8240                 switch (ret) {
8241                 case -NFS4ERR_DELAY:
8242                 case -NFS4ERR_CLIENTID_BUSY:
8243                         ssleep(1);
8244                         break;
8245                 default:
8246                         return ret;
8247                 }
8248         }
8249         return 0;
8250 }
8251
8252 int nfs4_destroy_clientid(struct nfs_client *clp)
8253 {
8254         const struct cred *cred;
8255         int ret = 0;
8256
8257         if (clp->cl_mvops->minor_version < 1)
8258                 goto out;
8259         if (clp->cl_exchange_flags == 0)
8260                 goto out;
8261         if (clp->cl_preserve_clid)
8262                 goto out;
8263         cred = nfs4_get_clid_cred(clp);
8264         ret = nfs4_proc_destroy_clientid(clp, cred);
8265         put_cred(cred);
8266         switch (ret) {
8267         case 0:
8268         case -NFS4ERR_STALE_CLIENTID:
8269                 clp->cl_exchange_flags = 0;
8270         }
8271 out:
8272         return ret;
8273 }
8274
8275 #endif /* CONFIG_NFS_V4_1 */
8276
8277 struct nfs4_get_lease_time_data {
8278         struct nfs4_get_lease_time_args *args;
8279         struct nfs4_get_lease_time_res *res;
8280         struct nfs_client *clp;
8281 };
8282
8283 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
8284                                         void *calldata)
8285 {
8286         struct nfs4_get_lease_time_data *data =
8287                         (struct nfs4_get_lease_time_data *)calldata;
8288
8289         dprintk("--> %s\n", __func__);
8290         /* just setup sequence, do not trigger session recovery
8291            since we're invoked within one */
8292         nfs4_setup_sequence(data->clp,
8293                         &data->args->la_seq_args,
8294                         &data->res->lr_seq_res,
8295                         task);
8296         dprintk("<-- %s\n", __func__);
8297 }
8298
8299 /*
8300  * Called from nfs4_state_manager thread for session setup, so don't recover
8301  * from sequence operation or clientid errors.
8302  */
8303 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
8304 {
8305         struct nfs4_get_lease_time_data *data =
8306                         (struct nfs4_get_lease_time_data *)calldata;
8307
8308         dprintk("--> %s\n", __func__);
8309         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
8310                 return;
8311         switch (task->tk_status) {
8312         case -NFS4ERR_DELAY:
8313         case -NFS4ERR_GRACE:
8314                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
8315                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
8316                 task->tk_status = 0;
8317                 /* fall through */
8318         case -NFS4ERR_RETRY_UNCACHED_REP:
8319                 rpc_restart_call_prepare(task);
8320                 return;
8321         }
8322         dprintk("<-- %s\n", __func__);
8323 }
8324
8325 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
8326         .rpc_call_prepare = nfs4_get_lease_time_prepare,
8327         .rpc_call_done = nfs4_get_lease_time_done,
8328 };
8329
8330 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
8331 {
8332         struct rpc_task *task;
8333         struct nfs4_get_lease_time_args args;
8334         struct nfs4_get_lease_time_res res = {
8335                 .lr_fsinfo = fsinfo,
8336         };
8337         struct nfs4_get_lease_time_data data = {
8338                 .args = &args,
8339                 .res = &res,
8340                 .clp = clp,
8341         };
8342         struct rpc_message msg = {
8343                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
8344                 .rpc_argp = &args,
8345                 .rpc_resp = &res,
8346         };
8347         struct rpc_task_setup task_setup = {
8348                 .rpc_client = clp->cl_rpcclient,
8349                 .rpc_message = &msg,
8350                 .callback_ops = &nfs4_get_lease_time_ops,
8351                 .callback_data = &data,
8352                 .flags = RPC_TASK_TIMEOUT,
8353         };
8354         int status;
8355
8356         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
8357         task = rpc_run_task(&task_setup);
8358
8359         if (IS_ERR(task))
8360                 return PTR_ERR(task);
8361
8362         status = task->tk_status;
8363         rpc_put_task(task);
8364         return status;
8365 }
8366
8367 #ifdef CONFIG_NFS_V4_1
8368
8369 /*
8370  * Initialize the values to be used by the client in CREATE_SESSION
8371  * If nfs4_init_session set the fore channel request and response sizes,
8372  * use them.
8373  *
8374  * Set the back channel max_resp_sz_cached to zero to force the client to
8375  * always set csa_cachethis to FALSE because the current implementation
8376  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
8377  */
8378 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
8379                                     struct rpc_clnt *clnt)
8380 {
8381         unsigned int max_rqst_sz, max_resp_sz;
8382         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
8383         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
8384
8385         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
8386         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
8387
8388         /* Fore channel attributes */
8389         args->fc_attrs.max_rqst_sz = max_rqst_sz;
8390         args->fc_attrs.max_resp_sz = max_resp_sz;
8391         args->fc_attrs.max_ops = NFS4_MAX_OPS;
8392         args->fc_attrs.max_reqs = max_session_slots;
8393
8394         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
8395                 "max_ops=%u max_reqs=%u\n",
8396                 __func__,
8397                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
8398                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
8399
8400         /* Back channel attributes */
8401         args->bc_attrs.max_rqst_sz = max_bc_payload;
8402         args->bc_attrs.max_resp_sz = max_bc_payload;
8403         args->bc_attrs.max_resp_sz_cached = 0;
8404         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
8405         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
8406         if (args->bc_attrs.max_reqs > max_bc_slots)
8407                 args->bc_attrs.max_reqs = max_bc_slots;
8408
8409         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
8410                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
8411                 __func__,
8412                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
8413                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
8414                 args->bc_attrs.max_reqs);
8415 }
8416
8417 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
8418                 struct nfs41_create_session_res *res)
8419 {
8420         struct nfs4_channel_attrs *sent = &args->fc_attrs;
8421         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
8422
8423         if (rcvd->max_resp_sz > sent->max_resp_sz)
8424                 return -EINVAL;
8425         /*
8426          * Our requested max_ops is the minimum we need; we're not
8427          * prepared to break up compounds into smaller pieces than that.
8428          * So, no point even trying to continue if the server won't
8429          * cooperate:
8430          */
8431         if (rcvd->max_ops < sent->max_ops)
8432                 return -EINVAL;
8433         if (rcvd->max_reqs == 0)
8434                 return -EINVAL;
8435         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
8436                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
8437         return 0;
8438 }
8439
8440 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
8441                 struct nfs41_create_session_res *res)
8442 {
8443         struct nfs4_channel_attrs *sent = &args->bc_attrs;
8444         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
8445
8446         if (!(res->flags & SESSION4_BACK_CHAN))
8447                 goto out;
8448         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
8449                 return -EINVAL;
8450         if (rcvd->max_resp_sz < sent->max_resp_sz)
8451                 return -EINVAL;
8452         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
8453                 return -EINVAL;
8454         if (rcvd->max_ops > sent->max_ops)
8455                 return -EINVAL;
8456         if (rcvd->max_reqs > sent->max_reqs)
8457                 return -EINVAL;
8458 out:
8459         return 0;
8460 }
8461
8462 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
8463                                      struct nfs41_create_session_res *res)
8464 {
8465         int ret;
8466
8467         ret = nfs4_verify_fore_channel_attrs(args, res);
8468         if (ret)
8469                 return ret;
8470         return nfs4_verify_back_channel_attrs(args, res);
8471 }
8472
8473 static void nfs4_update_session(struct nfs4_session *session,
8474                 struct nfs41_create_session_res *res)
8475 {
8476         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
8477         /* Mark client id and session as being confirmed */
8478         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
8479         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
8480         session->flags = res->flags;
8481         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
8482         if (res->flags & SESSION4_BACK_CHAN)
8483                 memcpy(&session->bc_attrs, &res->bc_attrs,
8484                                 sizeof(session->bc_attrs));
8485 }
8486
8487 static int _nfs4_proc_create_session(struct nfs_client *clp,
8488                 const struct cred *cred)
8489 {
8490         struct nfs4_session *session = clp->cl_session;
8491         struct nfs41_create_session_args args = {
8492                 .client = clp,
8493                 .clientid = clp->cl_clientid,
8494                 .seqid = clp->cl_seqid,
8495                 .cb_program = NFS4_CALLBACK,
8496         };
8497         struct nfs41_create_session_res res;
8498
8499         struct rpc_message msg = {
8500                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
8501                 .rpc_argp = &args,
8502                 .rpc_resp = &res,
8503                 .rpc_cred = cred,
8504         };
8505         int status;
8506
8507         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
8508         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
8509
8510         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
8511                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8512         trace_nfs4_create_session(clp, status);
8513
8514         switch (status) {
8515         case -NFS4ERR_STALE_CLIENTID:
8516         case -NFS4ERR_DELAY:
8517         case -ETIMEDOUT:
8518         case -EACCES:
8519         case -EAGAIN:
8520                 goto out;
8521         };
8522
8523         clp->cl_seqid++;
8524         if (!status) {
8525                 /* Verify the session's negotiated channel_attrs values */
8526                 status = nfs4_verify_channel_attrs(&args, &res);
8527                 /* Increment the clientid slot sequence id */
8528                 if (status)
8529                         goto out;
8530                 nfs4_update_session(session, &res);
8531         }
8532 out:
8533         return status;
8534 }
8535
8536 /*
8537  * Issues a CREATE_SESSION operation to the server.
8538  * It is the responsibility of the caller to verify the session is
8539  * expired before calling this routine.
8540  */
8541 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
8542 {
8543         int status;
8544         unsigned *ptr;
8545         struct nfs4_session *session = clp->cl_session;
8546
8547         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
8548
8549         status = _nfs4_proc_create_session(clp, cred);
8550         if (status)
8551                 goto out;
8552
8553         /* Init or reset the session slot tables */
8554         status = nfs4_setup_session_slot_tables(session);
8555         dprintk("slot table setup returned %d\n", status);
8556         if (status)
8557                 goto out;
8558
8559         ptr = (unsigned *)&session->sess_id.data[0];
8560         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
8561                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
8562 out:
8563         dprintk("<-- %s\n", __func__);
8564         return status;
8565 }
8566
8567 /*
8568  * Issue the over-the-wire RPC DESTROY_SESSION.
8569  * The caller must serialize access to this routine.
8570  */
8571 int nfs4_proc_destroy_session(struct nfs4_session *session,
8572                 const struct cred *cred)
8573 {
8574         struct rpc_message msg = {
8575                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
8576                 .rpc_argp = session,
8577                 .rpc_cred = cred,
8578         };
8579         int status = 0;
8580
8581         dprintk("--> nfs4_proc_destroy_session\n");
8582
8583         /* session is still being setup */
8584         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
8585                 return 0;
8586
8587         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
8588                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8589         trace_nfs4_destroy_session(session->clp, status);
8590
8591         if (status)
8592                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
8593                         "Session has been destroyed regardless...\n", status);
8594
8595         dprintk("<-- nfs4_proc_destroy_session\n");
8596         return status;
8597 }
8598
8599 /*
8600  * Renew the cl_session lease.
8601  */
8602 struct nfs4_sequence_data {
8603         struct nfs_client *clp;
8604         struct nfs4_sequence_args args;
8605         struct nfs4_sequence_res res;
8606 };
8607
8608 static void nfs41_sequence_release(void *data)
8609 {
8610         struct nfs4_sequence_data *calldata = data;
8611         struct nfs_client *clp = calldata->clp;
8612
8613         if (refcount_read(&clp->cl_count) > 1)
8614                 nfs4_schedule_state_renewal(clp);
8615         nfs_put_client(clp);
8616         kfree(calldata);
8617 }
8618
8619 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8620 {
8621         switch(task->tk_status) {
8622         case -NFS4ERR_DELAY:
8623                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8624                 return -EAGAIN;
8625         default:
8626                 nfs4_schedule_lease_recovery(clp);
8627         }
8628         return 0;
8629 }
8630
8631 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
8632 {
8633         struct nfs4_sequence_data *calldata = data;
8634         struct nfs_client *clp = calldata->clp;
8635
8636         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
8637                 return;
8638
8639         trace_nfs4_sequence(clp, task->tk_status);
8640         if (task->tk_status < 0) {
8641                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
8642                 if (refcount_read(&clp->cl_count) == 1)
8643                         goto out;
8644
8645                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
8646                         rpc_restart_call_prepare(task);
8647                         return;
8648                 }
8649         }
8650         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
8651 out:
8652         dprintk("<-- %s\n", __func__);
8653 }
8654
8655 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
8656 {
8657         struct nfs4_sequence_data *calldata = data;
8658         struct nfs_client *clp = calldata->clp;
8659         struct nfs4_sequence_args *args;
8660         struct nfs4_sequence_res *res;
8661
8662         args = task->tk_msg.rpc_argp;
8663         res = task->tk_msg.rpc_resp;
8664
8665         nfs4_setup_sequence(clp, args, res, task);
8666 }
8667
8668 static const struct rpc_call_ops nfs41_sequence_ops = {
8669         .rpc_call_done = nfs41_sequence_call_done,
8670         .rpc_call_prepare = nfs41_sequence_prepare,
8671         .rpc_release = nfs41_sequence_release,
8672 };
8673
8674 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
8675                 const struct cred *cred,
8676                 struct nfs4_slot *slot,
8677                 bool is_privileged)
8678 {
8679         struct nfs4_sequence_data *calldata;
8680         struct rpc_message msg = {
8681                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
8682                 .rpc_cred = cred,
8683         };
8684         struct rpc_task_setup task_setup_data = {
8685                 .rpc_client = clp->cl_rpcclient,
8686                 .rpc_message = &msg,
8687                 .callback_ops = &nfs41_sequence_ops,
8688                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
8689         };
8690         struct rpc_task *ret;
8691
8692         ret = ERR_PTR(-EIO);
8693         if (!refcount_inc_not_zero(&clp->cl_count))
8694                 goto out_err;
8695
8696         ret = ERR_PTR(-ENOMEM);
8697         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8698         if (calldata == NULL)
8699                 goto out_put_clp;
8700         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
8701         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
8702         msg.rpc_argp = &calldata->args;
8703         msg.rpc_resp = &calldata->res;
8704         calldata->clp = clp;
8705         task_setup_data.callback_data = calldata;
8706
8707         ret = rpc_run_task(&task_setup_data);
8708         if (IS_ERR(ret))
8709                 goto out_err;
8710         return ret;
8711 out_put_clp:
8712         nfs_put_client(clp);
8713 out_err:
8714         nfs41_release_slot(slot);
8715         return ret;
8716 }
8717
8718 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
8719 {
8720         struct rpc_task *task;
8721         int ret = 0;
8722
8723         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
8724                 return -EAGAIN;
8725         task = _nfs41_proc_sequence(clp, cred, NULL, false);
8726         if (IS_ERR(task))
8727                 ret = PTR_ERR(task);
8728         else
8729                 rpc_put_task_async(task);
8730         dprintk("<-- %s status=%d\n", __func__, ret);
8731         return ret;
8732 }
8733
8734 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
8735 {
8736         struct rpc_task *task;
8737         int ret;
8738
8739         task = _nfs41_proc_sequence(clp, cred, NULL, true);
8740         if (IS_ERR(task)) {
8741                 ret = PTR_ERR(task);
8742                 goto out;
8743         }
8744         ret = rpc_wait_for_completion_task(task);
8745         if (!ret)
8746                 ret = task->tk_status;
8747         rpc_put_task(task);
8748 out:
8749         dprintk("<-- %s status=%d\n", __func__, ret);
8750         return ret;
8751 }
8752
8753 struct nfs4_reclaim_complete_data {
8754         struct nfs_client *clp;
8755         struct nfs41_reclaim_complete_args arg;
8756         struct nfs41_reclaim_complete_res res;
8757 };
8758
8759 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
8760 {
8761         struct nfs4_reclaim_complete_data *calldata = data;
8762
8763         nfs4_setup_sequence(calldata->clp,
8764                         &calldata->arg.seq_args,
8765                         &calldata->res.seq_res,
8766                         task);
8767 }
8768
8769 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8770 {
8771         switch(task->tk_status) {
8772         case 0:
8773                 wake_up_all(&clp->cl_lock_waitq);
8774                 /* Fallthrough */
8775         case -NFS4ERR_COMPLETE_ALREADY:
8776         case -NFS4ERR_WRONG_CRED: /* What to do here? */
8777                 break;
8778         case -NFS4ERR_DELAY:
8779                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8780                 /* fall through */
8781         case -NFS4ERR_RETRY_UNCACHED_REP:
8782                 return -EAGAIN;
8783         case -NFS4ERR_BADSESSION:
8784         case -NFS4ERR_DEADSESSION:
8785         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
8786                 nfs4_schedule_session_recovery(clp->cl_session,
8787                                 task->tk_status);
8788                 break;
8789         default:
8790                 nfs4_schedule_lease_recovery(clp);
8791         }
8792         return 0;
8793 }
8794
8795 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
8796 {
8797         struct nfs4_reclaim_complete_data *calldata = data;
8798         struct nfs_client *clp = calldata->clp;
8799         struct nfs4_sequence_res *res = &calldata->res.seq_res;
8800
8801         dprintk("--> %s\n", __func__);
8802         if (!nfs41_sequence_done(task, res))
8803                 return;
8804
8805         trace_nfs4_reclaim_complete(clp, task->tk_status);
8806         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
8807                 rpc_restart_call_prepare(task);
8808                 return;
8809         }
8810         dprintk("<-- %s\n", __func__);
8811 }
8812
8813 static void nfs4_free_reclaim_complete_data(void *data)
8814 {
8815         struct nfs4_reclaim_complete_data *calldata = data;
8816
8817         kfree(calldata);
8818 }
8819
8820 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
8821         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
8822         .rpc_call_done = nfs4_reclaim_complete_done,
8823         .rpc_release = nfs4_free_reclaim_complete_data,
8824 };
8825
8826 /*
8827  * Issue a global reclaim complete.
8828  */
8829 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
8830                 const struct cred *cred)
8831 {
8832         struct nfs4_reclaim_complete_data *calldata;
8833         struct rpc_task *task;
8834         struct rpc_message msg = {
8835                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
8836                 .rpc_cred = cred,
8837         };
8838         struct rpc_task_setup task_setup_data = {
8839                 .rpc_client = clp->cl_rpcclient,
8840                 .rpc_message = &msg,
8841                 .callback_ops = &nfs4_reclaim_complete_call_ops,
8842                 .flags = RPC_TASK_ASYNC | RPC_TASK_NO_ROUND_ROBIN,
8843         };
8844         int status = -ENOMEM;
8845
8846         dprintk("--> %s\n", __func__);
8847         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8848         if (calldata == NULL)
8849                 goto out;
8850         calldata->clp = clp;
8851         calldata->arg.one_fs = 0;
8852
8853         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
8854         msg.rpc_argp = &calldata->arg;
8855         msg.rpc_resp = &calldata->res;
8856         task_setup_data.callback_data = calldata;
8857         task = rpc_run_task(&task_setup_data);
8858         if (IS_ERR(task)) {
8859                 status = PTR_ERR(task);
8860                 goto out;
8861         }
8862         status = rpc_wait_for_completion_task(task);
8863         if (status == 0)
8864                 status = task->tk_status;
8865         rpc_put_task(task);
8866 out:
8867         dprintk("<-- %s status=%d\n", __func__, status);
8868         return status;
8869 }
8870
8871 static void
8872 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
8873 {
8874         struct nfs4_layoutget *lgp = calldata;
8875         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
8876
8877         dprintk("--> %s\n", __func__);
8878         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
8879                                 &lgp->res.seq_res, task);
8880         dprintk("<-- %s\n", __func__);
8881 }
8882
8883 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
8884 {
8885         struct nfs4_layoutget *lgp = calldata;
8886
8887         dprintk("--> %s\n", __func__);
8888         nfs41_sequence_process(task, &lgp->res.seq_res);
8889         dprintk("<-- %s\n", __func__);
8890 }
8891
8892 static int
8893 nfs4_layoutget_handle_exception(struct rpc_task *task,
8894                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
8895 {
8896         struct inode *inode = lgp->args.inode;
8897         struct nfs_server *server = NFS_SERVER(inode);
8898         struct pnfs_layout_hdr *lo;
8899         int nfs4err = task->tk_status;
8900         int err, status = 0;
8901         LIST_HEAD(head);
8902
8903         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
8904
8905         nfs4_sequence_free_slot(&lgp->res.seq_res);
8906
8907         switch (nfs4err) {
8908         case 0:
8909                 goto out;
8910
8911         /*
8912          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
8913          * on the file. set tk_status to -ENODATA to tell upper layer to
8914          * retry go inband.
8915          */
8916         case -NFS4ERR_LAYOUTUNAVAILABLE:
8917                 status = -ENODATA;
8918                 goto out;
8919         /*
8920          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
8921          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
8922          */
8923         case -NFS4ERR_BADLAYOUT:
8924                 status = -EOVERFLOW;
8925                 goto out;
8926         /*
8927          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
8928          * (or clients) writing to the same RAID stripe except when
8929          * the minlength argument is 0 (see RFC5661 section 18.43.3).
8930          *
8931          * Treat it like we would RECALLCONFLICT -- we retry for a little
8932          * while, and then eventually give up.
8933          */
8934         case -NFS4ERR_LAYOUTTRYLATER:
8935                 if (lgp->args.minlength == 0) {
8936                         status = -EOVERFLOW;
8937                         goto out;
8938                 }
8939                 status = -EBUSY;
8940                 break;
8941         case -NFS4ERR_RECALLCONFLICT:
8942                 status = -ERECALLCONFLICT;
8943                 break;
8944         case -NFS4ERR_DELEG_REVOKED:
8945         case -NFS4ERR_ADMIN_REVOKED:
8946         case -NFS4ERR_EXPIRED:
8947         case -NFS4ERR_BAD_STATEID:
8948                 exception->timeout = 0;
8949                 spin_lock(&inode->i_lock);
8950                 lo = NFS_I(inode)->layout;
8951                 /* If the open stateid was bad, then recover it. */
8952                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
8953                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
8954                         spin_unlock(&inode->i_lock);
8955                         exception->state = lgp->args.ctx->state;
8956                         exception->stateid = &lgp->args.stateid;
8957                         break;
8958                 }
8959
8960                 /*
8961                  * Mark the bad layout state as invalid, then retry
8962                  */
8963                 pnfs_mark_layout_stateid_invalid(lo, &head);
8964                 spin_unlock(&inode->i_lock);
8965                 nfs_commit_inode(inode, 0);
8966                 pnfs_free_lseg_list(&head);
8967                 status = -EAGAIN;
8968                 goto out;
8969         }
8970
8971         err = nfs4_handle_exception(server, nfs4err, exception);
8972         if (!status) {
8973                 if (exception->retry)
8974                         status = -EAGAIN;
8975                 else
8976                         status = err;
8977         }
8978 out:
8979         dprintk("<-- %s\n", __func__);
8980         return status;
8981 }
8982
8983 size_t max_response_pages(struct nfs_server *server)
8984 {
8985         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
8986         return nfs_page_array_len(0, max_resp_sz);
8987 }
8988
8989 static void nfs4_layoutget_release(void *calldata)
8990 {
8991         struct nfs4_layoutget *lgp = calldata;
8992
8993         dprintk("--> %s\n", __func__);
8994         nfs4_sequence_free_slot(&lgp->res.seq_res);
8995         pnfs_layoutget_free(lgp);
8996         dprintk("<-- %s\n", __func__);
8997 }
8998
8999 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9000         .rpc_call_prepare = nfs4_layoutget_prepare,
9001         .rpc_call_done = nfs4_layoutget_done,
9002         .rpc_release = nfs4_layoutget_release,
9003 };
9004
9005 struct pnfs_layout_segment *
9006 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9007 {
9008         struct inode *inode = lgp->args.inode;
9009         struct nfs_server *server = NFS_SERVER(inode);
9010         struct rpc_task *task;
9011         struct rpc_message msg = {
9012                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9013                 .rpc_argp = &lgp->args,
9014                 .rpc_resp = &lgp->res,
9015                 .rpc_cred = lgp->cred,
9016         };
9017         struct rpc_task_setup task_setup_data = {
9018                 .rpc_client = server->client,
9019                 .rpc_message = &msg,
9020                 .callback_ops = &nfs4_layoutget_call_ops,
9021                 .callback_data = lgp,
9022                 .flags = RPC_TASK_ASYNC,
9023         };
9024         struct pnfs_layout_segment *lseg = NULL;
9025         struct nfs4_exception exception = {
9026                 .inode = inode,
9027                 .timeout = *timeout,
9028         };
9029         int status = 0;
9030
9031         dprintk("--> %s\n", __func__);
9032
9033         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
9034         pnfs_get_layout_hdr(NFS_I(inode)->layout);
9035
9036         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9037
9038         task = rpc_run_task(&task_setup_data);
9039         if (IS_ERR(task))
9040                 return ERR_CAST(task);
9041         status = rpc_wait_for_completion_task(task);
9042         if (status != 0)
9043                 goto out;
9044
9045         if (task->tk_status < 0) {
9046                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9047                 *timeout = exception.timeout;
9048         } else if (lgp->res.layoutp->len == 0) {
9049                 status = -EAGAIN;
9050                 *timeout = nfs4_update_delay(&exception.timeout);
9051         } else
9052                 lseg = pnfs_layout_process(lgp);
9053 out:
9054         trace_nfs4_layoutget(lgp->args.ctx,
9055                         &lgp->args.range,
9056                         &lgp->res.range,
9057                         &lgp->res.stateid,
9058                         status);
9059
9060         rpc_put_task(task);
9061         dprintk("<-- %s status=%d\n", __func__, status);
9062         if (status)
9063                 return ERR_PTR(status);
9064         return lseg;
9065 }
9066
9067 static void
9068 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9069 {
9070         struct nfs4_layoutreturn *lrp = calldata;
9071
9072         dprintk("--> %s\n", __func__);
9073         nfs4_setup_sequence(lrp->clp,
9074                         &lrp->args.seq_args,
9075                         &lrp->res.seq_res,
9076                         task);
9077         if (!pnfs_layout_is_valid(lrp->args.layout))
9078                 rpc_exit(task, 0);
9079 }
9080
9081 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9082 {
9083         struct nfs4_layoutreturn *lrp = calldata;
9084         struct nfs_server *server;
9085
9086         dprintk("--> %s\n", __func__);
9087
9088         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9089                 return;
9090
9091         server = NFS_SERVER(lrp->args.inode);
9092         switch (task->tk_status) {
9093         case -NFS4ERR_OLD_STATEID:
9094                 if (nfs4_layoutreturn_refresh_stateid(&lrp->args.stateid,
9095                                         &lrp->args.range,
9096                                         lrp->args.inode))
9097                         goto out_restart;
9098                 /* Fallthrough */
9099         default:
9100                 task->tk_status = 0;
9101                 /* Fallthrough */
9102         case 0:
9103                 break;
9104         case -NFS4ERR_DELAY:
9105                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9106                         break;
9107                 goto out_restart;
9108         }
9109         dprintk("<-- %s\n", __func__);
9110         return;
9111 out_restart:
9112         task->tk_status = 0;
9113         nfs4_sequence_free_slot(&lrp->res.seq_res);
9114         rpc_restart_call_prepare(task);
9115 }
9116
9117 static void nfs4_layoutreturn_release(void *calldata)
9118 {
9119         struct nfs4_layoutreturn *lrp = calldata;
9120         struct pnfs_layout_hdr *lo = lrp->args.layout;
9121
9122         dprintk("--> %s\n", __func__);
9123         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9124                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9125         nfs4_sequence_free_slot(&lrp->res.seq_res);
9126         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9127                 lrp->ld_private.ops->free(&lrp->ld_private);
9128         pnfs_put_layout_hdr(lrp->args.layout);
9129         nfs_iput_and_deactive(lrp->inode);
9130         kfree(calldata);
9131         dprintk("<-- %s\n", __func__);
9132 }
9133
9134 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9135         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9136         .rpc_call_done = nfs4_layoutreturn_done,
9137         .rpc_release = nfs4_layoutreturn_release,
9138 };
9139
9140 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9141 {
9142         struct rpc_task *task;
9143         struct rpc_message msg = {
9144                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9145                 .rpc_argp = &lrp->args,
9146                 .rpc_resp = &lrp->res,
9147                 .rpc_cred = lrp->cred,
9148         };
9149         struct rpc_task_setup task_setup_data = {
9150                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9151                 .rpc_message = &msg,
9152                 .callback_ops = &nfs4_layoutreturn_call_ops,
9153                 .callback_data = lrp,
9154         };
9155         int status = 0;
9156
9157         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9158                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9159                         &task_setup_data.rpc_client, &msg);
9160
9161         dprintk("--> %s\n", __func__);
9162         if (!sync) {
9163                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9164                 if (!lrp->inode) {
9165                         nfs4_layoutreturn_release(lrp);
9166                         return -EAGAIN;
9167                 }
9168                 task_setup_data.flags |= RPC_TASK_ASYNC;
9169         }
9170         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0);
9171         task = rpc_run_task(&task_setup_data);
9172         if (IS_ERR(task))
9173                 return PTR_ERR(task);
9174         if (sync)
9175                 status = task->tk_status;
9176         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9177         dprintk("<-- %s status=%d\n", __func__, status);
9178         rpc_put_task(task);
9179         return status;
9180 }
9181
9182 static int
9183 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9184                 struct pnfs_device *pdev,
9185                 const struct cred *cred)
9186 {
9187         struct nfs4_getdeviceinfo_args args = {
9188                 .pdev = pdev,
9189                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9190                         NOTIFY_DEVICEID4_DELETE,
9191         };
9192         struct nfs4_getdeviceinfo_res res = {
9193                 .pdev = pdev,
9194         };
9195         struct rpc_message msg = {
9196                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9197                 .rpc_argp = &args,
9198                 .rpc_resp = &res,
9199                 .rpc_cred = cred,
9200         };
9201         int status;
9202
9203         dprintk("--> %s\n", __func__);
9204         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9205         if (res.notification & ~args.notify_types)
9206                 dprintk("%s: unsupported notification\n", __func__);
9207         if (res.notification != args.notify_types)
9208                 pdev->nocache = 1;
9209
9210         dprintk("<-- %s status=%d\n", __func__, status);
9211
9212         return status;
9213 }
9214
9215 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9216                 struct pnfs_device *pdev,
9217                 const struct cred *cred)
9218 {
9219         struct nfs4_exception exception = { };
9220         int err;
9221
9222         do {
9223                 err = nfs4_handle_exception(server,
9224                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9225                                         &exception);
9226         } while (exception.retry);
9227         return err;
9228 }
9229 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9230
9231 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9232 {
9233         struct nfs4_layoutcommit_data *data = calldata;
9234         struct nfs_server *server = NFS_SERVER(data->args.inode);
9235
9236         nfs4_setup_sequence(server->nfs_client,
9237                         &data->args.seq_args,
9238                         &data->res.seq_res,
9239                         task);
9240 }
9241
9242 static void
9243 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9244 {
9245         struct nfs4_layoutcommit_data *data = calldata;
9246         struct nfs_server *server = NFS_SERVER(data->args.inode);
9247
9248         if (!nfs41_sequence_done(task, &data->res.seq_res))
9249                 return;
9250
9251         switch (task->tk_status) { /* Just ignore these failures */
9252         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9253         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9254         case -NFS4ERR_BADLAYOUT:     /* no layout */
9255         case -NFS4ERR_GRACE:        /* loca_recalim always false */
9256                 task->tk_status = 0;
9257         case 0:
9258                 break;
9259         default:
9260                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9261                         rpc_restart_call_prepare(task);
9262                         return;
9263                 }
9264         }
9265 }
9266
9267 static void nfs4_layoutcommit_release(void *calldata)
9268 {
9269         struct nfs4_layoutcommit_data *data = calldata;
9270
9271         pnfs_cleanup_layoutcommit(data);
9272         nfs_post_op_update_inode_force_wcc(data->args.inode,
9273                                            data->res.fattr);
9274         put_cred(data->cred);
9275         nfs_iput_and_deactive(data->inode);
9276         kfree(data);
9277 }
9278
9279 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9280         .rpc_call_prepare = nfs4_layoutcommit_prepare,
9281         .rpc_call_done = nfs4_layoutcommit_done,
9282         .rpc_release = nfs4_layoutcommit_release,
9283 };
9284
9285 int
9286 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
9287 {
9288         struct rpc_message msg = {
9289                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
9290                 .rpc_argp = &data->args,
9291                 .rpc_resp = &data->res,
9292                 .rpc_cred = data->cred,
9293         };
9294         struct rpc_task_setup task_setup_data = {
9295                 .task = &data->task,
9296                 .rpc_client = NFS_CLIENT(data->args.inode),
9297                 .rpc_message = &msg,
9298                 .callback_ops = &nfs4_layoutcommit_ops,
9299                 .callback_data = data,
9300         };
9301         struct rpc_task *task;
9302         int status = 0;
9303
9304         dprintk("NFS: initiating layoutcommit call. sync %d "
9305                 "lbw: %llu inode %lu\n", sync,
9306                 data->args.lastbytewritten,
9307                 data->args.inode->i_ino);
9308
9309         if (!sync) {
9310                 data->inode = nfs_igrab_and_active(data->args.inode);
9311                 if (data->inode == NULL) {
9312                         nfs4_layoutcommit_release(data);
9313                         return -EAGAIN;
9314                 }
9315                 task_setup_data.flags = RPC_TASK_ASYNC;
9316         }
9317         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
9318         task = rpc_run_task(&task_setup_data);
9319         if (IS_ERR(task))
9320                 return PTR_ERR(task);
9321         if (sync)
9322                 status = task->tk_status;
9323         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
9324         dprintk("%s: status %d\n", __func__, status);
9325         rpc_put_task(task);
9326         return status;
9327 }
9328
9329 /*
9330  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
9331  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
9332  */
9333 static int
9334 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9335                     struct nfs_fsinfo *info,
9336                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
9337 {
9338         struct nfs41_secinfo_no_name_args args = {
9339                 .style = SECINFO_STYLE_CURRENT_FH,
9340         };
9341         struct nfs4_secinfo_res res = {
9342                 .flavors = flavors,
9343         };
9344         struct rpc_message msg = {
9345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
9346                 .rpc_argp = &args,
9347                 .rpc_resp = &res,
9348         };
9349         struct rpc_clnt *clnt = server->client;
9350         const struct cred *cred = NULL;
9351         int status;
9352
9353         if (use_integrity) {
9354                 clnt = server->nfs_client->cl_rpcclient;
9355                 cred = nfs4_get_clid_cred(server->nfs_client);
9356                 msg.rpc_cred = cred;
9357         }
9358
9359         dprintk("--> %s\n", __func__);
9360         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
9361                                 &res.seq_res, RPC_TASK_NO_ROUND_ROBIN);
9362         dprintk("<-- %s status=%d\n", __func__, status);
9363
9364         put_cred(cred);
9365
9366         return status;
9367 }
9368
9369 static int
9370 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9371                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
9372 {
9373         struct nfs4_exception exception = {
9374                 .interruptible = true,
9375         };
9376         int err;
9377         do {
9378                 /* first try using integrity protection */
9379                 err = -NFS4ERR_WRONGSEC;
9380
9381                 /* try to use integrity protection with machine cred */
9382                 if (_nfs4_is_integrity_protected(server->nfs_client))
9383                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9384                                                           flavors, true);
9385
9386                 /*
9387                  * if unable to use integrity protection, or SECINFO with
9388                  * integrity protection returns NFS4ERR_WRONGSEC (which is
9389                  * disallowed by spec, but exists in deployed servers) use
9390                  * the current filesystem's rpc_client and the user cred.
9391                  */
9392                 if (err == -NFS4ERR_WRONGSEC)
9393                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9394                                                           flavors, false);
9395
9396                 switch (err) {
9397                 case 0:
9398                 case -NFS4ERR_WRONGSEC:
9399                 case -ENOTSUPP:
9400                         goto out;
9401                 default:
9402                         err = nfs4_handle_exception(server, err, &exception);
9403                 }
9404         } while (exception.retry);
9405 out:
9406         return err;
9407 }
9408
9409 static int
9410 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
9411                     struct nfs_fsinfo *info)
9412 {
9413         int err;
9414         struct page *page;
9415         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
9416         struct nfs4_secinfo_flavors *flavors;
9417         struct nfs4_secinfo4 *secinfo;
9418         int i;
9419
9420         page = alloc_page(GFP_KERNEL);
9421         if (!page) {
9422                 err = -ENOMEM;
9423                 goto out;
9424         }
9425
9426         flavors = page_address(page);
9427         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
9428
9429         /*
9430          * Fall back on "guess and check" method if
9431          * the server doesn't support SECINFO_NO_NAME
9432          */
9433         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
9434                 err = nfs4_find_root_sec(server, fhandle, info);
9435                 goto out_freepage;
9436         }
9437         if (err)
9438                 goto out_freepage;
9439
9440         for (i = 0; i < flavors->num_flavors; i++) {
9441                 secinfo = &flavors->flavors[i];
9442
9443                 switch (secinfo->flavor) {
9444                 case RPC_AUTH_NULL:
9445                 case RPC_AUTH_UNIX:
9446                 case RPC_AUTH_GSS:
9447                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
9448                                         &secinfo->flavor_info);
9449                         break;
9450                 default:
9451                         flavor = RPC_AUTH_MAXFLAVOR;
9452                         break;
9453                 }
9454
9455                 if (!nfs_auth_info_match(&server->auth_info, flavor))
9456                         flavor = RPC_AUTH_MAXFLAVOR;
9457
9458                 if (flavor != RPC_AUTH_MAXFLAVOR) {
9459                         err = nfs4_lookup_root_sec(server, fhandle,
9460                                                    info, flavor);
9461                         if (!err)
9462                                 break;
9463                 }
9464         }
9465
9466         if (flavor == RPC_AUTH_MAXFLAVOR)
9467                 err = -EPERM;
9468
9469 out_freepage:
9470         put_page(page);
9471         if (err == -EACCES)
9472                 return -EPERM;
9473 out:
9474         return err;
9475 }
9476
9477 static int _nfs41_test_stateid(struct nfs_server *server,
9478                 nfs4_stateid *stateid,
9479                 const struct cred *cred)
9480 {
9481         int status;
9482         struct nfs41_test_stateid_args args = {
9483                 .stateid = stateid,
9484         };
9485         struct nfs41_test_stateid_res res;
9486         struct rpc_message msg = {
9487                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
9488                 .rpc_argp = &args,
9489                 .rpc_resp = &res,
9490                 .rpc_cred = cred,
9491         };
9492         struct rpc_clnt *rpc_client = server->client;
9493
9494         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9495                 &rpc_client, &msg);
9496
9497         dprintk("NFS call  test_stateid %p\n", stateid);
9498         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
9499         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
9500                         &args.seq_args, &res.seq_res);
9501         if (status != NFS_OK) {
9502                 dprintk("NFS reply test_stateid: failed, %d\n", status);
9503                 return status;
9504         }
9505         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
9506         return -res.status;
9507 }
9508
9509 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
9510                 int err, struct nfs4_exception *exception)
9511 {
9512         exception->retry = 0;
9513         switch(err) {
9514         case -NFS4ERR_DELAY:
9515         case -NFS4ERR_RETRY_UNCACHED_REP:
9516                 nfs4_handle_exception(server, err, exception);
9517                 break;
9518         case -NFS4ERR_BADSESSION:
9519         case -NFS4ERR_BADSLOT:
9520         case -NFS4ERR_BAD_HIGH_SLOT:
9521         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9522         case -NFS4ERR_DEADSESSION:
9523                 nfs4_do_handle_exception(server, err, exception);
9524         }
9525 }
9526
9527 /**
9528  * nfs41_test_stateid - perform a TEST_STATEID operation
9529  *
9530  * @server: server / transport on which to perform the operation
9531  * @stateid: state ID to test
9532  * @cred: credential
9533  *
9534  * Returns NFS_OK if the server recognizes that "stateid" is valid.
9535  * Otherwise a negative NFS4ERR value is returned if the operation
9536  * failed or the state ID is not currently valid.
9537  */
9538 static int nfs41_test_stateid(struct nfs_server *server,
9539                 nfs4_stateid *stateid,
9540                 const struct cred *cred)
9541 {
9542         struct nfs4_exception exception = {
9543                 .interruptible = true,
9544         };
9545         int err;
9546         do {
9547                 err = _nfs41_test_stateid(server, stateid, cred);
9548                 nfs4_handle_delay_or_session_error(server, err, &exception);
9549         } while (exception.retry);
9550         return err;
9551 }
9552
9553 struct nfs_free_stateid_data {
9554         struct nfs_server *server;
9555         struct nfs41_free_stateid_args args;
9556         struct nfs41_free_stateid_res res;
9557 };
9558
9559 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
9560 {
9561         struct nfs_free_stateid_data *data = calldata;
9562         nfs4_setup_sequence(data->server->nfs_client,
9563                         &data->args.seq_args,
9564                         &data->res.seq_res,
9565                         task);
9566 }
9567
9568 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
9569 {
9570         struct nfs_free_stateid_data *data = calldata;
9571
9572         nfs41_sequence_done(task, &data->res.seq_res);
9573
9574         switch (task->tk_status) {
9575         case -NFS4ERR_DELAY:
9576                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
9577                         rpc_restart_call_prepare(task);
9578         }
9579 }
9580
9581 static void nfs41_free_stateid_release(void *calldata)
9582 {
9583         kfree(calldata);
9584 }
9585
9586 static const struct rpc_call_ops nfs41_free_stateid_ops = {
9587         .rpc_call_prepare = nfs41_free_stateid_prepare,
9588         .rpc_call_done = nfs41_free_stateid_done,
9589         .rpc_release = nfs41_free_stateid_release,
9590 };
9591
9592 /**
9593  * nfs41_free_stateid - perform a FREE_STATEID operation
9594  *
9595  * @server: server / transport on which to perform the operation
9596  * @stateid: state ID to release
9597  * @cred: credential
9598  * @privileged: set to true if this call needs to be privileged
9599  *
9600  * Note: this function is always asynchronous.
9601  */
9602 static int nfs41_free_stateid(struct nfs_server *server,
9603                 const nfs4_stateid *stateid,
9604                 const struct cred *cred,
9605                 bool privileged)
9606 {
9607         struct rpc_message msg = {
9608                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
9609                 .rpc_cred = cred,
9610         };
9611         struct rpc_task_setup task_setup = {
9612                 .rpc_client = server->client,
9613                 .rpc_message = &msg,
9614                 .callback_ops = &nfs41_free_stateid_ops,
9615                 .flags = RPC_TASK_ASYNC,
9616         };
9617         struct nfs_free_stateid_data *data;
9618         struct rpc_task *task;
9619
9620         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9621                 &task_setup.rpc_client, &msg);
9622
9623         dprintk("NFS call  free_stateid %p\n", stateid);
9624         data = kmalloc(sizeof(*data), GFP_NOFS);
9625         if (!data)
9626                 return -ENOMEM;
9627         data->server = server;
9628         nfs4_stateid_copy(&data->args.stateid, stateid);
9629
9630         task_setup.callback_data = data;
9631
9632         msg.rpc_argp = &data->args;
9633         msg.rpc_resp = &data->res;
9634         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
9635         task = rpc_run_task(&task_setup);
9636         if (IS_ERR(task))
9637                 return PTR_ERR(task);
9638         rpc_put_task(task);
9639         return 0;
9640 }
9641
9642 static void
9643 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
9644 {
9645         const struct cred *cred = lsp->ls_state->owner->so_cred;
9646
9647         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
9648         nfs4_free_lock_state(server, lsp);
9649 }
9650
9651 static bool nfs41_match_stateid(const nfs4_stateid *s1,
9652                 const nfs4_stateid *s2)
9653 {
9654         if (s1->type != s2->type)
9655                 return false;
9656
9657         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
9658                 return false;
9659
9660         if (s1->seqid == s2->seqid)
9661                 return true;
9662
9663         return s1->seqid == 0 || s2->seqid == 0;
9664 }
9665
9666 #endif /* CONFIG_NFS_V4_1 */
9667
9668 static bool nfs4_match_stateid(const nfs4_stateid *s1,
9669                 const nfs4_stateid *s2)
9670 {
9671         return nfs4_stateid_match(s1, s2);
9672 }
9673
9674
9675 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
9676         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9677         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9678         .recover_open   = nfs4_open_reclaim,
9679         .recover_lock   = nfs4_lock_reclaim,
9680         .establish_clid = nfs4_init_clientid,
9681         .detect_trunking = nfs40_discover_server_trunking,
9682 };
9683
9684 #if defined(CONFIG_NFS_V4_1)
9685 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
9686         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9687         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9688         .recover_open   = nfs4_open_reclaim,
9689         .recover_lock   = nfs4_lock_reclaim,
9690         .establish_clid = nfs41_init_clientid,
9691         .reclaim_complete = nfs41_proc_reclaim_complete,
9692         .detect_trunking = nfs41_discover_server_trunking,
9693 };
9694 #endif /* CONFIG_NFS_V4_1 */
9695
9696 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
9697         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9698         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9699         .recover_open   = nfs40_open_expired,
9700         .recover_lock   = nfs4_lock_expired,
9701         .establish_clid = nfs4_init_clientid,
9702 };
9703
9704 #if defined(CONFIG_NFS_V4_1)
9705 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
9706         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9707         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9708         .recover_open   = nfs41_open_expired,
9709         .recover_lock   = nfs41_lock_expired,
9710         .establish_clid = nfs41_init_clientid,
9711 };
9712 #endif /* CONFIG_NFS_V4_1 */
9713
9714 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
9715         .sched_state_renewal = nfs4_proc_async_renew,
9716         .get_state_renewal_cred = nfs4_get_renew_cred,
9717         .renew_lease = nfs4_proc_renew,
9718 };
9719
9720 #if defined(CONFIG_NFS_V4_1)
9721 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
9722         .sched_state_renewal = nfs41_proc_async_sequence,
9723         .get_state_renewal_cred = nfs4_get_machine_cred,
9724         .renew_lease = nfs4_proc_sequence,
9725 };
9726 #endif
9727
9728 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
9729         .get_locations = _nfs40_proc_get_locations,
9730         .fsid_present = _nfs40_proc_fsid_present,
9731 };
9732
9733 #if defined(CONFIG_NFS_V4_1)
9734 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
9735         .get_locations = _nfs41_proc_get_locations,
9736         .fsid_present = _nfs41_proc_fsid_present,
9737 };
9738 #endif  /* CONFIG_NFS_V4_1 */
9739
9740 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
9741         .minor_version = 0,
9742         .init_caps = NFS_CAP_READDIRPLUS
9743                 | NFS_CAP_ATOMIC_OPEN
9744                 | NFS_CAP_POSIX_LOCK,
9745         .init_client = nfs40_init_client,
9746         .shutdown_client = nfs40_shutdown_client,
9747         .match_stateid = nfs4_match_stateid,
9748         .find_root_sec = nfs4_find_root_sec,
9749         .free_lock_state = nfs4_release_lockowner,
9750         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
9751         .alloc_seqid = nfs_alloc_seqid,
9752         .call_sync_ops = &nfs40_call_sync_ops,
9753         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
9754         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
9755         .state_renewal_ops = &nfs40_state_renewal_ops,
9756         .mig_recovery_ops = &nfs40_mig_recovery_ops,
9757 };
9758
9759 #if defined(CONFIG_NFS_V4_1)
9760 static struct nfs_seqid *
9761 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
9762 {
9763         return NULL;
9764 }
9765
9766 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
9767         .minor_version = 1,
9768         .init_caps = NFS_CAP_READDIRPLUS
9769                 | NFS_CAP_ATOMIC_OPEN
9770                 | NFS_CAP_POSIX_LOCK
9771                 | NFS_CAP_STATEID_NFSV41
9772                 | NFS_CAP_ATOMIC_OPEN_V1
9773                 | NFS_CAP_LGOPEN,
9774         .init_client = nfs41_init_client,
9775         .shutdown_client = nfs41_shutdown_client,
9776         .match_stateid = nfs41_match_stateid,
9777         .find_root_sec = nfs41_find_root_sec,
9778         .free_lock_state = nfs41_free_lock_state,
9779         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9780         .alloc_seqid = nfs_alloc_no_seqid,
9781         .session_trunk = nfs4_test_session_trunk,
9782         .call_sync_ops = &nfs41_call_sync_ops,
9783         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9784         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9785         .state_renewal_ops = &nfs41_state_renewal_ops,
9786         .mig_recovery_ops = &nfs41_mig_recovery_ops,
9787 };
9788 #endif
9789
9790 #if defined(CONFIG_NFS_V4_2)
9791 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
9792         .minor_version = 2,
9793         .init_caps = NFS_CAP_READDIRPLUS
9794                 | NFS_CAP_ATOMIC_OPEN
9795                 | NFS_CAP_POSIX_LOCK
9796                 | NFS_CAP_STATEID_NFSV41
9797                 | NFS_CAP_ATOMIC_OPEN_V1
9798                 | NFS_CAP_LGOPEN
9799                 | NFS_CAP_ALLOCATE
9800                 | NFS_CAP_COPY
9801                 | NFS_CAP_OFFLOAD_CANCEL
9802                 | NFS_CAP_DEALLOCATE
9803                 | NFS_CAP_SEEK
9804                 | NFS_CAP_LAYOUTSTATS
9805                 | NFS_CAP_CLONE
9806                 | NFS_CAP_LAYOUTERROR,
9807         .init_client = nfs41_init_client,
9808         .shutdown_client = nfs41_shutdown_client,
9809         .match_stateid = nfs41_match_stateid,
9810         .find_root_sec = nfs41_find_root_sec,
9811         .free_lock_state = nfs41_free_lock_state,
9812         .call_sync_ops = &nfs41_call_sync_ops,
9813         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9814         .alloc_seqid = nfs_alloc_no_seqid,
9815         .session_trunk = nfs4_test_session_trunk,
9816         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9817         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9818         .state_renewal_ops = &nfs41_state_renewal_ops,
9819         .mig_recovery_ops = &nfs41_mig_recovery_ops,
9820 };
9821 #endif
9822
9823 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
9824         [0] = &nfs_v4_0_minor_ops,
9825 #if defined(CONFIG_NFS_V4_1)
9826         [1] = &nfs_v4_1_minor_ops,
9827 #endif
9828 #if defined(CONFIG_NFS_V4_2)
9829         [2] = &nfs_v4_2_minor_ops,
9830 #endif
9831 };
9832
9833 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
9834 {
9835         ssize_t error, error2;
9836
9837         error = generic_listxattr(dentry, list, size);
9838         if (error < 0)
9839                 return error;
9840         if (list) {
9841                 list += error;
9842                 size -= error;
9843         }
9844
9845         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
9846         if (error2 < 0)
9847                 return error2;
9848         return error + error2;
9849 }
9850
9851 static const struct inode_operations nfs4_dir_inode_operations = {
9852         .create         = nfs_create,
9853         .lookup         = nfs_lookup,
9854         .atomic_open    = nfs_atomic_open,
9855         .link           = nfs_link,
9856         .unlink         = nfs_unlink,
9857         .symlink        = nfs_symlink,
9858         .mkdir          = nfs_mkdir,
9859         .rmdir          = nfs_rmdir,
9860         .mknod          = nfs_mknod,
9861         .rename         = nfs_rename,
9862         .permission     = nfs_permission,
9863         .getattr        = nfs_getattr,
9864         .setattr        = nfs_setattr,
9865         .listxattr      = nfs4_listxattr,
9866 };
9867
9868 static const struct inode_operations nfs4_file_inode_operations = {
9869         .permission     = nfs_permission,
9870         .getattr        = nfs_getattr,
9871         .setattr        = nfs_setattr,
9872         .listxattr      = nfs4_listxattr,
9873 };
9874
9875 const struct nfs_rpc_ops nfs_v4_clientops = {
9876         .version        = 4,                    /* protocol version */
9877         .dentry_ops     = &nfs4_dentry_operations,
9878         .dir_inode_ops  = &nfs4_dir_inode_operations,
9879         .file_inode_ops = &nfs4_file_inode_operations,
9880         .file_ops       = &nfs4_file_operations,
9881         .getroot        = nfs4_proc_get_root,
9882         .submount       = nfs4_submount,
9883         .try_mount      = nfs4_try_mount,
9884         .getattr        = nfs4_proc_getattr,
9885         .setattr        = nfs4_proc_setattr,
9886         .lookup         = nfs4_proc_lookup,
9887         .lookupp        = nfs4_proc_lookupp,
9888         .access         = nfs4_proc_access,
9889         .readlink       = nfs4_proc_readlink,
9890         .create         = nfs4_proc_create,
9891         .remove         = nfs4_proc_remove,
9892         .unlink_setup   = nfs4_proc_unlink_setup,
9893         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
9894         .unlink_done    = nfs4_proc_unlink_done,
9895         .rename_setup   = nfs4_proc_rename_setup,
9896         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
9897         .rename_done    = nfs4_proc_rename_done,
9898         .link           = nfs4_proc_link,
9899         .symlink        = nfs4_proc_symlink,
9900         .mkdir          = nfs4_proc_mkdir,
9901         .rmdir          = nfs4_proc_rmdir,
9902         .readdir        = nfs4_proc_readdir,
9903         .mknod          = nfs4_proc_mknod,
9904         .statfs         = nfs4_proc_statfs,
9905         .fsinfo         = nfs4_proc_fsinfo,
9906         .pathconf       = nfs4_proc_pathconf,
9907         .set_capabilities = nfs4_server_capabilities,
9908         .decode_dirent  = nfs4_decode_dirent,
9909         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
9910         .read_setup     = nfs4_proc_read_setup,
9911         .read_done      = nfs4_read_done,
9912         .write_setup    = nfs4_proc_write_setup,
9913         .write_done     = nfs4_write_done,
9914         .commit_setup   = nfs4_proc_commit_setup,
9915         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
9916         .commit_done    = nfs4_commit_done,
9917         .lock           = nfs4_proc_lock,
9918         .clear_acl_cache = nfs4_zap_acl_attr,
9919         .close_context  = nfs4_close_context,
9920         .open_context   = nfs4_atomic_open,
9921         .have_delegation = nfs4_have_delegation,
9922         .alloc_client   = nfs4_alloc_client,
9923         .init_client    = nfs4_init_client,
9924         .free_client    = nfs4_free_client,
9925         .create_server  = nfs4_create_server,
9926         .clone_server   = nfs_clone_server,
9927 };
9928
9929 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
9930         .name   = XATTR_NAME_NFSV4_ACL,
9931         .list   = nfs4_xattr_list_nfs4_acl,
9932         .get    = nfs4_xattr_get_nfs4_acl,
9933         .set    = nfs4_xattr_set_nfs4_acl,
9934 };
9935
9936 const struct xattr_handler *nfs4_xattr_handlers[] = {
9937         &nfs4_xattr_nfs4_acl_handler,
9938 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
9939         &nfs4_xattr_nfs4_label_handler,
9940 #endif
9941         NULL
9942 };
9943
9944 /*
9945  * Local variables:
9946  *  c-basic-offset: 8
9947  * End:
9948  */